Asked • 04/20/19

Is half-a-tablet of X a substitute for a tablet of X/2?

This may be anecdotal. At the pharmacy earlier, the prescription called for a drug with X mg of the target chemical. The pharmacy however only had stock of a higher potency of the same brand. E.g. A prescription may call for 25mg of a particular chemical, whereas the pharmacy could only service a request for 50mg of that chemical in the **same brand**._According to the pharmacist, and the medic - a proportional fraction of higher potency drug of the same brand may be substituted for the lower potency. Thus in the example above, half-a-tablet of 50mg may serve in lieu of a single tablet of 25mg._For a given brand - Is half-a-tablet of X a substitute for a full tablet of X/2? - Does the corollary scale upwards too?

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