How to Take a Proper Medication History
An accurate medication history is the foundation of safe dispensing. It's not just 'what did the doctor prescribe?' — it's everything the patient takes, including what they buy, share, and forget to mention.
Beyond the prescription
Ask: what are you taking in total? This includes prescription drugs, over-the-counter products, herbal and vitamin supplements, 'as needed' medications, and anything borrowed from a family member. Patients don't always think of OTC and herbal products as 'medications' — name them explicitly.
Also ask about allergies and previous adverse reactions — not just 'are you allergic to anything?' but 'what happened when you took it?' A stomach upset is different from anaphylaxis.
Adherence and recent changes
Knowing what's prescribed isn't enough — ask how the patient actually takes it. 'Do you take it every day as written, or do you sometimes skip or change the timing?' Recent changes are critical: a new drug added or stopped recently is the most likely cause of a new interaction or side effect.
Document the history. An undocumented history is a conversation; a documented one is a safety tool that the next professional can build on.
Practical example
The hidden herbal interaction
A patient on warfarin mentions 'I started a herbal supplement for energy last month' — only because the pharmacist asked specifically about herbal products. St John's Wort induces warfarin metabolism, lowering its effect. The pharmacist alerts the prescriber, the INR is checked, and a potential clot is prevented. The herb was invisible until the question was specific.
Key takeaways
- Ask what they take in total — including OTC, herbal, and borrowed.
- Ask about allergies and what specifically happened.
- Ask how they actually take it, not just what's prescribed.
- Recent changes are the most likely cause of new problems.
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