Bethanechol:

Correct Answer: B

Rationale: The correct answer is B because Bethanechol is a muscarinic receptor agonist that increases detrusor muscle tone to promote bladder emptying. This is its primary pharmacological action. Choice A is incorrect because Bethanechol does not affect LDL cholesterol levels. Choice C is incorrect because Bethanechol does not have a significant effect on bronchial airway constriction. Choice D is incorrect because Bethanechol does not decrease gastric acid secretion.

Correct Answer: D

Rationale: The correct answer is D: Mylanta. Tetracycline can form insoluble complexes with divalent or trivalent cations, such as aluminum, magnesium, calcium, and iron, reducing its absorption and effectiveness. Mylanta contains aluminum and magnesium, which can bind to tetracycline, leading to reduced therapeutic effects. Choices A, B, and C (Ativan, Tylenol, Colace) do not contain cations that interfere with tetracycline absorption.

Correct Answer: C

Rationale: The correct answer is C because drug interactions occur when one drug alters the effect of another drug by affecting its pharmacokinetic or pharmacodynamic properties. This can lead to either potentiation or reduction of the drug's effects. Choice A is incorrect as toxic dosages do not necessarily lead to drug interactions. Choice B is incorrect as an increase in pharmacodynamics of bound drugs does not necessarily involve interactions with other drugs. Choice D is incorrect because an increase in drug excretion does not directly relate to drug interactions.

Correct Answer: C

Rationale: The correct answer is C: Fluconazole. This drug is appropriate for the patient likely suffering from a fungal infection like Candida. Nystatin (A) is also an antifungal but is more commonly used topically. Metronidazole (B) is an antibiotic used for bacterial infections. Acyclovir (D) is an antiviral used for herpes infections. In this case, the patient's symptoms point towards a fungal infection, making Fluconazole the most suitable choice.

Correct Answer: C

Rationale: Rationale: 1. Candida albicans is a type of yeast commonly causing fungal infections. 2. Nystatin is an antifungal medication effective against Candida species. 3. Nystatin works by binding to fungal cell membranes and disrupting their integrity. 4. Griseofulvin (Choice A) is used to treat fungal skin infections, not Candida. 5. Terbinafine (Choice B) is mainly used for dermatophyte infections, not Candida. 6. Caspofungin (Choice D) is more suitable for invasive fungal infections like aspergillosis, not Candida. Summary: - Choice A, B, and D are incorrect because they do not target Candida albicans specifically. - Choice C is correct as nystatin is the appropriate treatment for Candida albicans infections.