Indications for etidronate administration are the following, EXEPT:

Correct Answer: C

Rationale: The correct answer is C: Hypophosphatemia. Etidronate is a bisphosphonate used to treat Paget's disease and osteoporosis by inhibiting bone resorption. Hypophosphatemia is a condition characterized by low phosphate levels in the blood, and etidronate is not indicated for this. Hypercalcemia is not an indication for etidronate as it can further decrease calcium levels.

Correct Answer: B

Rationale: The correct answer is B: Gentamycin. Aminoglycosides are a class of antibiotics that inhibit bacterial protein synthesis. Gentamycin falls under this class due to its mechanism of action. Erythromycin (A) is a macrolide antibiotic, Vancomycin (C) is a glycopeptide antibiotic, and Polymyxin (D) is a polypeptide antibiotic. These antibiotics do not belong to the aminoglycosides class, making them incorrect choices.

Correct Answer: A

Rationale: The correct answer is A because Metronidazole is indicated for intra-abdominal infections, vaginitis, and enterocolitis due to its effectiveness against anaerobic bacteria. Pneumonia, influenza, and use as a disinfectant are not appropriate indications as Metronidazole does not target the specific pathogens associated with these conditions. It is important to use this antibiotic judiciously to avoid resistance and unnecessary side effects.

Correct Answer: B

Rationale: The correct answer is B: Rimantadine. Rimantadine is used for the prevention and treatment of influenza A virus infections. It works by inhibiting the replication of the virus. Choice A, Acyclovir, is used for herpes virus infections, not influenza. Choice C, Saquinavir, is an antiretroviral drug used for HIV, not influenza. Choice D, Foscarnet, is used to treat certain viral infections like CMV and herpes, but not for influenza A prevention. Rimantadine specifically targets influenza A virus, making it the correct choice for this question.

Correct Answer: B

Rationale: The correct answer is B: Verapamil. Verapamil is a calcium channel blocker used for hypertension and arrhythmias. It can cause constipation as a side effect, which matches the patient's symptoms. Propranolol (A) can cause diarrhea. Diltiazem (C) and nitroglycerin (D) are less likely to cause constipation compared to verapamil.