NEET MBBS Medical Admission Guidence📒📕🖌

- receptor and drug-target interactions; - agonism and antagonism; - dose-response relationships; - potency and efficacy; - therapeutic effects; - adverse effects; - tolerance and tachyphylaxis; - therapeutic index; - pharmacodynamic mechanisms of drug interactions. The central question is: > What does the medicine act on, and how does that action produce both benefit and harm? ### 3.2 Pharmacokinetics Pharmacokinetics explains what the body does to medicines through: - absorption; - bioavailability; - distribution; - protein binding; - metabolism; - enzyme induction and inhibition; - elimination; - clearance; - volume of distribution; - half-life; - steady state; - loading and maintenance doses. These principles explain why drug exposure changes with dose, route, interval, repeated administration, organ function and interacting medicines. ### 3.3 Rational treatment selection Treatment selection requires consideration of: 1. diagnosis and therapeutic objective; 2. evidence of efficacy; 3. patient-specific suitability; 4. contraindications; 5. adverse effects; 6. interactions; 7. route and formulation; 8. adherence; 9. cost and availability; 10. monitoring requirements. This is the basis of rational prescribing and the P-drug approach. The most appropriate medicine is not necessarily the newest or most potent. It is the medicine with the best balance of efficacy, safety, suitability and cost for the individual patient. ### 3.4 Safe prescribing Students learn to write and interpret prescriptions containing: - generic drug name; - formulation; - dose; - route; - frequency; - duration; - administration instructions; - relevant warnings; - follow-up requirements. Students also learn to prevent: - incomplete prescriptions; - unsafe abbreviations; - dose and route errors; - duplicate therapy; - contraindicated combinations; - unnecessary polypharmacy. Prescription writing is a patient-safety responsibility, not a clerical task. ### 3.5 Adverse drug reactions, drug-related harms and pharmacovigilance Students learn to recognise and respond to: - dose-related toxicity; - hypersensitivity; - idiosyncratic reactions; - organ toxicity; - teratogenicity; - carcinogenicity; - withdrawal effects; - dependence. Pharmacovigilance follows the sequence: > Recognise → manage → document → report → prevent recurrence Prescribing responsibility continues after treatment begins. ### 3.6 Individualising therapy Treatment may require modification according to: - age; - pregnancy and lactation; - renal function; - hepatic function; - genetic variation; - comorbidity; - polypharmacy; - critical illness. This replaces uniform prescribing with patient-centred prescribing. ### 3.7 Monitoring treatment Therapeutic management is a continuous process: > Select → prescribe → administer → monitor → reassess → continue, modify or stop Monitoring may include: - clinical response; - laboratory parameters; - therapeutic drug monitoring; - toxicity indicators; - adherence; - treatment failure. ### 3.8 Applying systemic pharmacology For every important therapeutic class, students should understand: > Mechanism → effects → indications → adverse effects → contraindications → interactions → administration → monitoring This framework applies across cardiovascular, respiratory, gastrointestinal, endocrine, neurological, antimicrobial, anti-inflammatory, oncological, immunological and emergency pharmacotherapy. ### 3.9 Antimicrobial therapy Microbiology and Pharmacology have complementary functions: - Microbiology identifies or infers the infectious agent and susceptibility pattern. - Pharmacology selects and doses the antimicrobial, evaluates tissue penetration, anticipates toxicity and interactions, and defines monitoring. Students therefore learn: - empirical and definitive therapy; - selective toxicity; - spectrum of activity; - concentration-dependent and time-dependent activity; - combination therapy; - prophylaxis; - resistance selection; - stewardship; - dose adjustment.