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What do you write on the prescription when the dosage has to be taken as required?

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What do you write on the prescription when the dosage has to be taken as required?

(a) a.c.

(b) p.c.

(c) p.r.n.

(d) p.r.

I got this question during an online interview.

This interesting question is from Controlled Release Medication topic in portion Controlled Release Medication of Drug Biotechnology

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Right option is (c) p.r.n.

Explanation: P.r.n. means the drug can be taken as required. That means whenever the patient feels like he has to take the medicine he will take. Such as paracetamol given only when the patient feels feverish.  When a doctor writes a.c. on prescription for a drug that means you should take it before food. P.c. means after food. P.r means the dosage has to be given rectally.

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