Pharmacology Fundamentals
Expert-defined terms from the Professional Certificate in Medication Management (United Kingdom) course at Greenwich School of Business and Finance. Free to read, free to share, paired with a professional course.
Absorption – The movement of a drug from the site of administration into… #
Related terms: Bioavailability, first‑pass metabolism. Example: Oral tablets dissolve in the stomach and are absorbed in the small intestine. Practical application includes selecting dosage forms that maximize absorption for drugs with poor oral uptake. Challenges involve variability due to gastric pH, food effects, and patient-specific factors such as gastrointestinal disease.
Adverse Drug Reaction (ADR) – An unwanted, harmful effect resulting from… #
Related terms: Side effect, toxicity. Example: Rash caused by penicillin. In practice, pharmacists monitor patient records to detect ADRs early. Challenges include distinguishing ADRs from disease symptoms and managing polypharmacy‑related interactions.
Anaesthetic – A drug that induces loss of sensation or consciousness to f… #
Related terms: Local anesthetic, general anesthetic. Example: Lidocaine for dental infiltration. Practical use requires knowledge of dosage, onset, and duration. Challenges include allergic reactions, toxicity at high plasma concentrations, and patient variability.
Antagonist – A substance that binds to a receptor and blocks the action o… #
Related terms: Receptor blocker, inverse agonist. Example: Naloxone reverses opioid overdose by blocking μ‑opioid receptors. In clinical practice, antagonists are used to counteract excess drug effects. Challenges involve timing of administration and potential precipitated withdrawal.
Antibiotic – An agent that kills or inhibits the growth of bacteria #
Related terms: Antimicrobial, bactericidal, bacteriostatic. Example: Amoxicillin used for streptococcal throat infection. Practical application includes selecting narrow‑spectrum agents to reduce resistance. Challenges encompass emerging resistance, allergic reactions, and impact on normal flora.
Anticoagulant – A medication that interferes with the blood clotting casc… #
Related terms: Antiplatelet, warfarin, direct oral anticoagulant (DOAC). Example: Apixaban for atrial fibrillation. Practical use requires dose adjustment based on renal function. Challenges include bleeding risk, drug‑drug interactions, and monitoring requirements for vitamin K antagonists.
Anticonvulsant – A drug used to prevent or reduce the frequency of seizur… #
Related terms: Antiepileptic, seizure threshold. Example: Carbamazepine for focal seizures. In practice, therapeutic drug monitoring guides dosing. Challenges involve enzyme induction, teratogenicity, and dose‑related CNS side effects.
Antidiabetic – Medication that lowers blood glucose levels in patients wi… #
Related terms: Insulin, oral hypoglycemic agents, GLP‑1 agonist. Example: Metformin improves insulin sensitivity. Practical application includes titrating doses to achieve glycaemic targets. Challenges comprise hypoglycaemia risk, renal dosing adjustments, and patient adherence.
Antifungal – An agent that kills or inhibits the growth of fungi #
Related terms: Azole, polyene, echinocandin. Example: Fluconazole for candidiasis. Practical use requires consideration of drug‑drug interactions, especially with azoles. Challenges involve resistance, hepatic toxicity, and limited oral bioavailability of some agents.
Antihistamine – A drug that blocks histamine receptors, reducing allergic… #
Related terms: H1 blocker, H2 blocker, sedating antihistamine. Example: Cetirizine for allergic rhinitis. Practical application includes selecting non‑sedating agents for daytime use. Challenges include anticholinergic side effects in the elderly and drug interactions with CNS depressants.
Antihypertensive – Medication that lowers elevated blood pressure #
Related terms: ACE inhibitor, beta‑blocker, calcium channel blocker. Example: Lisinopril reduces angiotensin‑II mediated vasoconstriction. Practical use demands regular monitoring of blood pressure and renal function. Challenges include orthostatic hypotension, electrolyte disturbances, and adherence issues.
Antimicrobial Stewardship – An organized program promoting the appropriat… #
Related terms: Antibiotic policy, de‑escalation, stewardship team. Example: Audit of surgical prophylaxis. Practical implementation includes guideline development and education. Challenges involve prescriber resistance, data collection, and balancing prompt therapy with restriction.
Antineoplastic – Drugs that inhibit the growth or spread of malignant cel… #
Related terms: Chemotherapy, targeted therapy, cytotoxic. Example: Paclitaxel for breast cancer. Practical application includes dose calculation based on body surface area. Challenges comprise myelosuppression, neuropathy, and complex scheduling.
Antipsychotic – Medication used to manage psychosis, including schizophre… #
Related terms: Typical antipsychotic, atypical antipsychotic, dopamine antagonist. Example: Risperidone blocks dopamine D2 receptors. Practical use requires monitoring for extrapyramidal symptoms and metabolic syndrome. Challenges include adherence, dose titration, and drug‑induced tardive dyskinesia.
API (Active Pharmaceutical Ingredient) – The component of a drug product… #
Related terms: Excipient, bulk drug, formulation. Example: Ibuprofen as the API in pain relievers. Practical relevance includes quality control and regulatory compliance. Challenges involve stability, polymorphism, and bioavailability optimization.
Arrhythmia – An abnormal heart rhythm that may be treated pharmacological… #
Related terms: Antiarrhythmic, ventricular tachycardia, atrial fibrillation. Example: Amiodarone for ventricular arrhythmias. Practical application includes dose adjustment based on ECG changes. Challenges comprise pro‑arrhythmic risk, organ toxicity, and drug interactions.
Bioavailability – The proportion of an administered dose that reaches sys… #
Related terms: First‑pass effect, absorption, Cmax. Example: Sublingual nitroglycerin has near‑100 % bioavailability. Practical use guides dose conversion between routes. Challenges involve formulation design, food effects, and inter‑patient variability.
Biopharmaceutics Classification System (BCS) – A framework categorizing d… #
Related terms: Class I, Class II, Class III, Class IV. Example: Caffeine is a BCS Class I drug (high solubility, high permeability). Practical application helps determine need for bioequivalence studies. Challenges include accurate solubility measurement and classification of borderline compounds.
Bronchodilator – A medication that relaxes bronchial smooth muscle, impro… #
Related terms: Β2‑agonist, anticholinergic, rescue inhaler. Example: Salbutamol used for acute asthma attacks. Practical use includes patient education on inhaler technique. Challenges include tachyphylaxis, over‑use, and cardiovascular side effects.
Calcium Channel Blocker (CCB) – A class of antihypertensive agents that i… #
Related terms: Dihydropyridine, non‑dihydropyridine, vasodilation. Example: Amlodipine reduces peripheral resistance. Practical application includes treating angina and hypertension. Challenges involve peripheral edema, drug interactions with CYP3A4 inhibitors, and dose‑related dizziness.
Cardiotoxicity – Damage to the heart muscle caused by drugs or toxins #
Related terms: Arrhythmia, myocardial infarction, QT prolongation. Example: Doxorubicin may cause dose‑dependent cardiomyopathy. Practical monitoring includes baseline echocardiography and periodic LVEF assessment. Challenges consist of balancing oncologic efficacy with cardiac safety and recognizing early subclinical changes.
Chemotherapy – The use of cytotoxic drugs to treat malignant disease #
Related terms: Regimen, dose‑dense, myelosuppression. Example: CHOP protocol for lymphoma. Practical considerations involve pre‑medication, anti‑emetics, and growth factor support. Challenges include severe adverse effects, resistance, and patient quality of life.
Chronic Kidney Disease (CKD) Dosing – Adjusting medication dosages based… #
related terms: EGFR, dose reduction, renal excretion. Example: Reducing gabapentin dose in stage 4 CKD. Practical application requires calculation of creatinine clearance. Challenges involve limited data for many drugs, risk of under‑treatment, and accumulation toxicity.
Clinical Pharmacokinetics – The study of drug absorption, distribution, m… #
Related terms: Half‑life, clearance, volume of distribution. Example: Calculating loading dose using Vd and target concentration. Practical use guides individualized dosing regimens. Challenges include inter‑patient variability, disease‑related alterations, and limited sampling opportunities.
Combination Therapy – The use of two or more drugs to achieve a therapeut… #
Related terms: Synergism, polypharmacy, fixed‑dose combination. Example: Metformin plus sitagliptin for type 2 diabetes. Practical benefits include improved efficacy and adherence. Challenges involve increased interaction risk, cost, and complexity of monitoring.
Contraindication – A specific situation where a drug should not be used b… #
Related terms: Absolute contraindication, relative contraindication, precaution. Example: ACE inhibitors are contraindicated in pregnancy. Practical relevance includes thorough patient history taking. Challenges include hidden contraindications and clinician awareness.
Corticosteroid – A steroid hormone used for its anti‑inflammatory and imm… #
Related terms: Glucocorticoid, mineralocorticoid, adrenal suppression. Example: Prednisone for acute exacerbation of COPD. Practical application includes tapering to avoid withdrawal. Challenges involve hyperglycaemia, osteoporosis, and infection risk.
Creatinine Clearance (CrCl) – An estimate of renal filtration capacity us… #
Related terms: Cockcroft‑Gault, MDRD, eGFR. Example: Calculating CrCl to dose enoxaparin. Practical use guides dose reductions for renally cleared drugs. Challenges include inaccurate weight measurement, muscle mass variability, and elderly patient considerations.
Cytokine Release Syndrome (CRS) – An inflammatory response triggered by c… #
Related terms: CAR‑T cell therapy, IL‑6 blocker, tocilizumab. Example: Managing CRS after tisagenlecleucel infusion. Practical monitoring includes fever and hypotension. Challenges include rapid escalation, overlapping toxicities, and need for multidisciplinary care.
Delirium – An acute, fluctuating disturbance of consciousness and cogniti… #
Related terms: Anticholinergic burden, psychotropic, ICU delirium. Example: Haloperidol used to control agitation. Practical assessment uses Confusion Assessment Method. Challenges include distinguishing drug‑induced delirium from metabolic causes and minimizing anticholinergic load.
Drug Interaction – A pharmacological or physiological change in the effec… #
Related terms: Synergistic, antagonistic, CYP450 inhibition. Example: Clarithromycin inhibiting CYP3A4 increases simvastatin levels. Practical approach includes reviewing medication lists and using interaction checkers. Challenges involve complex polypharmacy, genetic polymorphisms, and over‑the‑counter products.
Drug Metabolism – The enzymatic conversion of a drug into more water‑solu… #
Related terms: Phase I, Phase II, CYP450, induction. Example: Acetaminophen undergoing glucuronidation. Practical relevance includes predicting drug‑drug interactions and toxicity. Challenges include inter‑individual enzyme variability and hepatic impairment.
Drug Monograph – A concise, evidence‑based summary of a medication’s prop… #
Related terms: Product information, SPC, formularies. Example: A hospital drug monograph for warfarin. Practical use supports safe dispensing and counseling. Challenges include keeping information up‑to‑date and ensuring accessibility for all staff.
Drug Resistance – The reduced effectiveness of a drug due to adaptive cha… #
Related terms: Antimicrobial resistance, MDR, cross‑resistance. Example: MRSA resistant to beta‑lactams. Practical implications involve selecting alternative agents and infection control measures. Challenges comprise limited therapeutic options and the need for stewardship.
Drug Toxicity – Harmful effects that occur when drug concentrations excee… #
Related terms: Overdose, therapeutic index, adverse effect. Example: Acetaminophen hepatotoxicity at high doses. Practical monitoring includes serum drug levels and organ function tests. Challenges involve early detection, patient education, and antidote availability.
Duration of Action – The time interval during which a drug exerts its the… #
Related terms: Half‑life, dosing interval, steady state. Example: Long‑acting insulin glargine provides basal coverage for 24 hours. Practical application guides dosing frequency. Challenges include patient adherence and variability in metabolism.
Efflux Transporter – Membrane proteins that pump drugs out of cells, infl… #
Related terms: P‑glycoprotein, MDR1, drug resistance. Example: P‑gp limits brain penetration of many chemotherapeutics. Practical relevance includes predicting drug‑drug interactions. Challenges involve limited in‑vitro models and inter‑individual expression differences.
Enteric Coating – A protective polymer layer applied to tablets to preven… #
Related terms: Delayed‑release, gastric protection, pH‑dependent. Example: Aspirin enteric‑coated to reduce gastric irritation. Practical benefit is targeted release in the intestine. Challenges include coating integrity, cost, and potential for dose dumping.
Enzyme Induction – The increase in enzyme activity leading to faster meta… #
Related terms: CYP450 inducer, auto‑induction, drug interaction. Example: Carbamazepine inducing its own metabolism. Practical implication includes dose escalation over time. Challenges involve unpredictable magnitude of induction and impact on co‑administered drugs.
Enzyme Inhibition – The reduction of enzyme activity, slowing metabolism… #
Related terms: CYP450 inhibitor, competitive inhibition, drug interaction. Example: Fluoxetine inhibiting CYP2D6, raising levels of tricyclic antidepressants. Practical use includes dose reduction of affected drugs. Challenges include variable inhibition strength and patient-specific genetics.
Epinephrine – A catecholamine used for its vasoconstrictive and bronchodi… #
Related terms: Adrenaline, anaphylaxis, cardiac arrest. Example: Intramuscular 0.3 Mg for anaphylactic reaction. Practical administration requires rapid intramuscular injection. Challenges include dosing errors, tachycardia, and contraindications in certain cardiac conditions.
Excipients – Inactive substances added to a drug formulation to aid manuf… #
Related terms: Filler, binder, preservative. Example: Lactose as a filler in tablets. Practical relevance includes potential allergenicity and impact on drug release. Challenges involve excipient–patient interactions, especially in those with intolerances.
First‑Pass Metabolism – The hepatic elimination of a drug before it reach… #
Related terms: Oral bioavailability, hepatic clearance, prodrug. Example: Propranolol undergoes extensive first‑pass effect, reducing oral bioavailability. Practical implication includes selecting alternative routes or dosing adjustments. Challenges include inter‑patient variability and hepatic disease impact.
Formulary – An organized list of medications approved for use within a he… #
Related terms: Therapeutic interchange, drug panel, prescribing guidelines. Example: Hospital formulary includes generic amoxicillin but not brand‑only cephalosporins. Practical use promotes cost‑effective prescribing and safety. Challenges involve keeping the list current and balancing clinician autonomy.
Half‑Life (t½) – The time required for the plasma concentration of a drug… #
Related terms: Elimination rate, steady state, dosing interval. Example: Ibuprofen has a half‑life of ~2 hours, requiring multiple daily doses. Practical use informs dosing frequency and accumulation risk. Challenges include altered half‑life in renal or hepatic impairment.
Hypoglycaemic Agent – A drug that lowers blood glucose levels, used mainl… #
Related terms: Insulin, sulfonylurea, SGLT2 inhibitor. Example: Glibenclamide stimulates pancreatic insulin release. Practical application includes monitoring for hypoglycaemia, especially in elderly patients. Challenges involve dose titration, renal dosing, and interaction with other glucose‑lowering agents.
Immune Checkpoint Inhibitor – A class of anticancer drugs that block inhi… #
Related terms: PD‑1 inhibitor, CTLA‑4, immunotherapy. Example: Pembrolizumab targets PD‑1. Practical considerations include monitoring for immune‑related adverse events. Challenges include managing colitis, hepatitis, and endocrine dysfunctions.
Indication – The approved therapeutic use for a medication #
Related terms: Label, off‑label use, prescribing information. Example: Clopidogrel indicated for secondary prevention after myocardial infarction. Practical relevance involves matching patient condition with approved uses. Challenges arise when clinicians consider off‑label applications lacking robust evidence.
Inhalation Therapy – Administration of medication via the respiratory tra… #
Related terms: Aerosol, spacer, pulmonary delivery. Example: Inhaled corticosteroid for persistent asthma. Practical focus includes technique training and device maintenance. Challenges involve poor adherence, incorrect inhaler technique, and variability in lung deposition.
Intravenous (IV) Infusion – Delivery of medication directly into the bloo… #
Related terms: Bolus, drip, central line. Example: Vancomycin administered as a 30‑minute infusion. Practical considerations include infusion rate, compatibility, and monitoring for phlebitis. Challenges comprise catheter‑related infections, dosage errors, and fluid overload.
Ion Channel Blocker – A drug that inhibits the flow of ions across cell m… #
Related terms: Sodium channel blocker, calcium channel blocker, antiarrhythmic. Example: Lidocaine blocks cardiac sodium channels to treat ventricular arrhythmias. Practical use requires ECG monitoring. Challenges include pro‑arrhythmic potential and dose‑dependent toxicity.
Isotope – A variant of an element with a different number of neutrons, us… #
Related terms: Radiopharmaceutical, PET scan, I‑131. Example: Technetium‑99m for bone scintigraphy. Practical application includes dosing calculations based on activity. Challenges involve radiation safety, availability, and regulatory compliance.
Ketamine – A dissociative anaesthetic with analgesic and psychomimetic pr… #
Related terms: NMDA antagonist, sub‑dissociative dose, rapid‑onset antidepressant. Example: Low‑dose ketamine infusion for refractory depression. Practical considerations include monitoring blood pressure and emergence reactions. Challenges include potential for abuse, hallucinations, and liver metabolism variability.
Lactation – The period of milk production after childbirth; drug safety i… #
Related terms: Breastfeeding, infant exposure, milk‑to‑plasma ratio. Example: Paracetamol is considered compatible with lactation. Practical guidance includes assessing drug transfer into breast milk. Challenges involve limited data, infant susceptibility, and maternal benefit‑risk balance.
Lead‑In Formulation – A preparation that contains a small amount of activ… #
Related terms: Loading dose, burst release, pharmacokinetic tailoring. Example: A transdermal patch with an initial high‑dose layer. Practical use helps achieve rapid onset while maintaining steady state. Challenges include manufacturing complexity and patient perception.
Lead‑Time – The interval between prescribing a medication and its availab… #
Related terms: Turnaround time, supply chain, dispensing delay. Example: A hospital pharmacy’s average lead‑time for high‑alert drugs is 30 minutes. Practical relevance includes workflow planning and patient safety. Challenges involve stock‑outs, staffing shortages, and emergency situations.
Leukotriene Modifier – A drug that inhibits leukotriene pathways, reducin… #
Related terms: Montelukast, cysteinyl leukotriene receptor antagonist. Example: Montelukast taken nightly for exercise‑induced bronchoconstriction. Practical application includes oral administration for patients unable to use inhalers. Challenges include variable efficacy and potential neuropsychiatric side effects.
Linear Pharmacokinetics – A relationship where changes in dose produce pr… #
Related terms: Dose‑proportionality, predictable clearance. Example: Digoxin exhibits linear kinetics within therapeutic range. Practical benefit is straightforward dose scaling. Challenges arise when disease states or organ dysfunction alter linearity.
Loading Dose – An initial higher dose intended to quickly achieve therape… #
Related terms: Maintenance dose, steady state, pharmacokinetic loading. Example: A 1 g loading dose of vancomycin for severe infection. Practical use ensures prompt efficacy. Challenges involve risk of overshoot, especially in renal impairment, and need for careful monitoring.
Long‑Acting Injectable (LAI) – A depot formulation designed to release me… #
Related terms: Depot antipsychotic, sustained release, adherence aid. Example: Haloperidol decanoate administered every four weeks. Practical benefit includes improved adherence. Challenges comprise injection site reactions, delayed onset, and difficulty adjusting dose quickly.
Metabolism – The biochemical alteration of a drug, primarily by hepatic e… #
Related terms: Phase I, Phase II, CYP450. Example: Codeine metabolized to morphine via CYP2D6. Practical relevance includes predicting active metabolites and interactions. Challenges involve genetic polymorphisms and hepatic disease impact.
Microbial Susceptibility Testing – Laboratory methods to determine the mi… #
Related terms: Disc diffusion, CLSI guidelines, breakpoints. Example: Determining MIC for Staphylococcus aureus to guide vancomycin therapy. Practical use informs targeted therapy. Challenges include laboratory turnaround time, emerging resistance mechanisms, and interpretation variability.
Monoclonal Antibody – A laboratory‑produced protein that binds to a speci… #
Related terms: Biologic, immunotherapy, IgG1. Example: Trastuzumab for HER2‑positive breast cancer. Practical considerations involve infusion reactions and cardiac monitoring. Challenges include high cost, immunogenicity, and need for biomarkers to select patients.
Nephrotoxic Agent – A drug that can cause damage to renal tissue, leading… #
Related terms: Acute kidney injury, renal clearance, dose adjustment. Example: Aminoglycosides may cause tubular necrosis. Practical monitoring includes serum creatinine and urine output. Challenges involve balancing efficacy with toxicity and recognizing early signs.
Neurotransmitter Modulator – A medication that influences the activity of… #
Related terms: Serotonin reuptake inhibitor, GABA agonist, dopaminergic. Example: Fluoxetine increases serotonin availability. Practical use includes treating depression and anxiety. Challenges involve delayed onset, side‑effect profile, and drug interactions.
Non‑steroidal Anti‑inflammatory Drug (NSAID) – A class of analgesics that… #
Related terms: COX‑1, COX‑2, prostaglandin synthesis. Example: Ibuprofen for musculoskeletal pain. Practical considerations include dosing intervals and gastrointestinal protection. Challenges include cardiovascular risk, renal impairment, and ulcer formation.
Nurse‑Led Clinic – A healthcare setting where nurses independently manage… #
Related terms: Advanced practice nurse, prescribing authority, clinical governance. Example: Anticoagulation clinic run by nurse practitioners. Practical benefits include increased access and continuity of care. Challenges involve training requirements, scope of practice legislation, and interdisciplinary communication.
On‑label Use – Administration of a drug for an indication that is approve… #
Related terms: Indication, FDA‑approved, SPC. Example: Using atorvastatin for primary prevention of cardiovascular disease. Practical relevance includes reimbursement and legal considerations. Challenges arise when evidence supports broader use but formal approval lags.
Off‑label Use – Prescription of a medication for an indication not formal… #
Related terms: Compassionate use, experimental therapy, clinical discretion. Example: Using gabapentin for neuropathic pain despite no specific label. Practical benefit includes addressing unmet clinical needs. Challenges involve liability, limited evidence, and insurance coverage.
Opioid Analgesic – A drug that binds to opioid receptors to produce pain… #
Related terms: Μ‑receptor agonist, tolerance, dependence. Example: Morphine for severe postoperative pain. Practical considerations include titration, monitoring for respiratory depression, and use of rescue medication. Challenges involve risk of addiction, diversion, and regulatory restrictions.
Oral Bioavailability – The fraction of an orally administered dose that r… #
Example: The oral bioavailability of levothyroxine is ~80 %. Practical implications guide dose conversion from intravenous to oral routes. Challenges include food interactions, gastric pH variations, and formulation differences.
Pharmacodynamics – The study of the biochemical and physiological effects… #
Related terms: Receptor agonist, dose‑response curve, therapeutic index. Example: Β‑blockers reduce heart rate by antagonizing β‑adrenergic receptors. Practical use includes predicting clinical response. Challenges involve inter‑patient variability, receptor polymorphisms, and tolerance development.
Pharmacogenomics – The branch of pharmacology that examines how genetic v… #
Related terms: CYP2C19 polymorphism, personalized medicine, genotype‑guided dosing. Example: Patients with CYP2C19 poor metabolizer status require lower clopidogrel activation. Practical application includes pre‑emptive genotyping. Challenges involve cost, limited evidence for many drugs, and ethical considerations.
Pharmacokinetic Modeling – The use of mathematical equations to describe… #
Related terms: Compartmental model, NONMEM, population PK. Example: A two‑compartment model for vancomycin to predict trough levels. Practical relevance includes dose optimization in special populations. Challenges comprise data quality, model selection, and software proficiency.
Pharmacy Benefit Manager (PBM) – An organization that manages prescriptio… #
Related terms: Rebate, step therapy, tiered formulary. Example: PBM contracts negotiate discounts for generic antihypertensives. Practical impact includes cost containment and patient access. Challenges involve transparency, formulary restrictions, and potential conflicts of interest.
Phlebotomy – The process of drawing blood for laboratory analysis, essent… #
Related terms: Venipuncture, capillary sample, anticoagulant tube. Example: Collecting a trough vancomycin level before the next dose. Practical importance includes timing accuracy and sample handling. Challenges include patient discomfort, hemolysis, and proper labeling.
Placebo – An inert substance used as a control in clinical trials to asse… #
Related terms: Double‑blind, randomisation, no‑treatment control. Example: Sugar pill in a double‑blind study of a new antihypertensive. Practical relevance includes ethical considerations and patient expectations. Challenges involve maintaining blinding and managing placebo‑related adverse events.
Polypharmacy – The concurrent use of multiple medications by a patient, o… #
Related terms: Drug burden index, deprescribing, medication reconciliation. Example: An elderly patient taking antihypertensives, statins, antidepressants, and analgesics. Practical concerns include interaction risk and adherence. Challenges involve balancing therapeutic benefit with medication overload and monitoring.
Posology – The science of dosage selection, encompassing dose amount, fre… #
Related terms: Dosing regimen, therapeutic window, pharmacokinetic parameters. Example: Prescribing metformin 500 mg twice daily. Practical use ensures optimal efficacy while minimizing toxicity. Challenges include patient-specific factors such as age, organ function, and comorbidities.
Potency – A measure of a drug’s ability to produce a desired effect at a… #
Related terms: Efficacy, EC50, dose‑response. Example: Fentanyl is more potent than morphine, requiring lower doses for equivalent analgesia. Practical implication includes careful dose conversion. Challenges involve distinguishing potency from therapeutic index and avoiding dosing errors.
Pregnancy Category – Classification system indicating the potential risk… #
Related terms: Teratogenicity, FDA categories, contraindication. Example: Category X drugs such as isotretinoin are contraindicated in pregnancy. Practical application includes counseling women of child‑bearing age. Challenges include limited data for many agents and reliance on animal studies.
Protein Binding – The reversible attachment of a drug to plasma proteins,… #
Related terms: Albumin, free fraction, displacement interaction. Example: Warfarin is ~99 % protein‑bound. Practical relevance includes monitoring for displacement by other highly bound drugs. Challenges involve altered binding in hypoalbuminemia and disease states.
Prodrug – An inactive precursor that is metabolized in the body to produc… #
Related terms: Activation, biotransformation, carrier molecule. Example: Enalapril is converted to enalaprilat, the active ACE inhibitor. Practical benefit includes improved oral absorption. Challenges include variability in activation rates and potential accumulation of inactive intermediates.
Pharmacovigilance – The systematic collection, analysis, and interpretati… #
Related terms: Spontaneous reporting, signal detection, risk management. Example: Post‑marketing surveillance identifies rare hepatotoxicity of a new antihistamine. Practical role includes updating safety information and informing prescribers. Challenges involve under‑reporting, data quality, and causality assessment.
Pharmacoeconomics – The evaluation of the cost‑effectiveness of pharmaceu… #
Related terms: Cost‑utility analysis, QALY, budget impact. Example: Comparing the price per QALY of a biosimilar versus originator biologic. Practical application guides formulary decisions and reimbursement. Challenges include measuring indirect costs and accounting for long‑term outcomes.
Pharmacy Automation – Use of technology such as robotic dispensers, barco… #
Related terms: Medication distribution system, RFID, closed‑loop medication administration. Example: Automated dispensing cabinets in wards. Practical benefits include error reduction and efficiency. Challenges involve system downtime, staff training, and integration with electronic health records.
Pharmacy Law – Legal framework governing the practice of pharmacy, includ… #
Related terms: Medicines Act, GPhC standards, controlled drug schedule. Example: Regulations requiring double‑checking of high‑alert medications. Practical relevance includes compliance audits. Challenges include staying current with legislative changes and interpreting ambiguous statutes.
Pharmacy Practice Model – The organizational structure and delivery model… #
Related terms: Clinical pharmacy, community pharmacy, integrated care. Example: A multidisciplinary team where pharmacists conduct medication reviews. Practical implications include role delineation and workload distribution. Challenges involve resource allocation, training, and demonstrating clinical impact.
Pharmacy Technician – A health‑care professional who supports pharmacists… #
Related terms: Delegation, competency framework, supervised practice. Example: Preparing unit‑dose medications under pharmacist supervision. Practical contribution includes freeing pharmacist time for clinical activities. Challenges include ensuring adequate training and maintaining accountability.
Pharmacy Workflow – The sequence of processes from prescription receipt t… #
Related terms: Triage, verification, dispensing, counseling. Example: A three‑step workflow for high‑alert drugs: Verification, double‑check, and patient counselling. Practical aim is to minimise errors and improve efficiency. Challenges involve bottlenecks, staffing variability, and technology integration.
Phenytoin – An antiepileptic drug that stabilises neuronal membranes by b… #
Related terms: Enzyme inducer, therapeutic drug monitoring, narrow therapeutic index. Example: Maintenance dose of 300 mg daily for seizure control. Practical considerations include non‑linear kinetics and need for serum level monitoring. Challenges involve drug interactions, gingival hyperplasia, and dose adjustments in pregnancy.
Phytotherapy – Use of plant‑derived substances for therapeutic purposes #
Related terms: Herbal medicine, botanicals, phytochemical. Example: St. John’s wort for mild depression. Practical relevance includes patient disclosure and potential interactions. Challenges involve variable potency, lack of standardisation, and limited regulatory oversight.
Plasma Concentration – The amount of drug present in the blood plasma at… #
Related terms: Trough level, peak level, therapeutic range. Example: Target vancomycin trough of 15–20 mg/L for severe infection. Practical monitoring guides dose adjustments. Challenges include timing of sample collection, assay variability, and interpreting levels in altered physiology.
Polymorphism – Genetic variation that can affect drug metabolism, transpo… #
Related terms: CYP2D6, pharmacogenetics, allele frequency. Example: CYP2C19*2 allele leading to reduced clopidogrel activation. Practical application includes genotype‑guided therapy. Challenges involve limited testing availability and clinical decision support integration.
Posology – The determination of dose size, frequency, and route for optim… #
Posology – The determination of dose size, frequency, and route for optimal therapeutic effect.