Pharmacy Technician Certification Exam Practice Question

Correct Answer: B

Rationale: Humidity exposure significantly impacts a medication's stability by promoting degradation, especially in hygroscopic substances that absorb moisture. High humidity can lead to chemical reactions, altering the medication's efficacy and safety.

In contrast, while pH level (A) can affect certain medications, it is not a primary environmental factor like humidity. Active ingredient quantity (C) relates to dosage rather than stability, and the salt form of an active ingredient (D) influences solubility but is not an environmental factor. Thus, humidity exposure stands out as the key factor affecting medication stability.