Pharma 07: Pharmacogenetics — Why One Dose Never Fits All

This episode explores how genetics influences the way individuals handle and respond to medicines. Pharmacogenetics is framed not as a futuristic add-on, but as an extension of everyday pharmacology—explaining why standard doses fail some patients, harm others, and work beautifully for a few. We focus on principles that clinicians can recognise and apply, even when formal genetic testing is unavailable.Key takeaways you’ll build and reuse throughout the series:* Genetic variation as a modifier, not a determinant: how genes shift probabilities rather than dictate outcomes.* Metabolic phenotypes in practice: poor, intermediate, extensive, and ultra-rapid metabolisers—and why these labels matter clinically.* Targets versus handling: differences between genes affecting drug metabolism, transport, and receptor response.* When genetics becomes visible: classic examples where inherited variation reveals itself through toxicity or therapeutic failure.* Precision with humility: how to integrate genetic insight into prescribing without overconfidence or reductionism. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe