A pharmacist may substitute between different formulations with the same active ingredients and equivalent strength and duration if it improves patient compliance.

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The key idea is that pharmacists can substitute to improve adherence when the products are therapeutically equivalent. If two formulations share the same active ingredient and provide equivalent strength and duration, switching from one to the other is permissible as long as the substitution does not conflict with the prescriber’s instructions and the products are considered therapeutically equivalent. The goal is to preserve the same clinical effect and safety profile while making it easier for the patient to take the medication, which can boost adherence and ultimately outcomes. In practice, this means a substitution is allowed when the alternative formulation is equivalent in potency and duration and is not disallowed by the prescriber.