A 36-year-old woman grocery store manager with a fair complexion and blue eyes presents to her primary care physician for a routine exam. She mentions a friend of hers who is taking bimatoprost to increase the length and amount of her eyelashes and asks if you would recommend it for her. Her past medical history is significant for migraine headaches. Which of the following is a side effect you should warn her about?

Correct Answer: B

Rationale: Bimatoprost for eyelashes risks permanent iris darkening , increasing melanin, especially in light eyes. Glaucoma is its therapeutic use, not a side effect here. Stevens-Johnson , weight gain , and migraines (E) aren't linked. Darkening is a key cosmetic concern.

Correct Answer: D

Rationale: Novahistine DM combines codeine (antitussive), phenylephrine (decongestant), and chlorpheniramine (antihistamine), causing sedation and impaired judgment. 'Do not make important decisions or operate machinery' is critical, as codeine's CNS depression, amplified by chlorpheniramine, risks accidents (correct answers: 3, 4, 5). Water aids swallowing but isn't key. Bedside storage risks overuse. Adherence is vital but secondary to safety. Choice D prioritizes preventing harm.

Correct Answer: C

Rationale: Opioid antitussives suppress severe coughs , not congestion , mucus , or mild coughs . C reflects their use, making it correct.

Correct Answer: A

Rationale: Zidovudine, an antiretroviral, treats HIV but risks bone marrow suppression, causing anemia. Monitoring RBC count detects this, ensuring timely intervention (e.g., transfusion). Liver enzymes matter with other drugs. Potassium and glucose aren't primary concerns. RBC monitoring aligns with zidovudine's toxicity profile, critical in HIV where anemia impacts quality of life, making A the key value.

Correct Answer: A

Rationale: Most drugs are absorbed through passive diffusion across the gastrointestinal tract, following a concentration gradient, especially non-ionized forms.