What message must be included on prescriptions delivered to patients?

The correct answer emphasizes the critical importance of providing patients with safety information related to the use of their medication. Including a message about the effect of extremes on the drug's effectiveness ensures that patients are aware of how environmental factors can impact their treatment. This information helps to prevent medication misuse and ensures that patients follow instructions that can enhance the effectiveness of their medication.

In pharmaceuticals, it’s essential for patients to understand how conditions such as temperature or humidity can alter the potency or efficacy of medications, potentially leading to suboptimal therapeutic outcomes. By informing patients about these factors, pharmacists contribute to better adherence to treatment and patient safety.

Other options, while relevant in certain contexts, are not mandated to be included on all prescriptions. The warning about drowsiness is very specific and mainly applies to certain classes of medications. Keeping medications away from children is a critical safety concern, yet it is more of a general advisory rather than a requirement on every prescription. Consulting a doctor in case of an allergy is important advice but applies to specific circumstances and does not pertain to general medication use.