Sublingual nitroglycerin is prescribed PRN for an older adult female client with a history of chest pain. The client shows the practical nurse (PN) a plastic pill box that she purchased so the medication can always be readily available in her purse. Which action should the PN take?

Choice A reason: Tetracycline causes photosensitivity, increasing UV-induced skin damage risk due to its accumulation in skin cells, triggering photochemical reactions. Protecting skin with sunblock or clothing prevents severe sunburn or rash, making this critical instruction for safe use during chlamydia treatment.

Choice B reason: Taking tetracycline with meals or milk reduces absorption, as calcium and magnesium bind the drug, forming insoluble complexes. This decreases efficacy, making it incorrect. Tetracycline should be taken on an empty stomach to ensure optimal bioavailability for infection treatment.

Choice C reason: Grapefruit juice affects drugs metabolized by CYP3A4, not tetracycline, which is not significantly influenced by this enzyme. This instruction is irrelevant, as tetracycline’s pharmacokinetics are unaffected by grapefruit, making it unnecessary for managing chlamydia treatment.

Choice D reason: Wearing tampons during menses is unrelated to tetracycline use. The drug treats bacterial infections, not menstrual management, and has no gynecological implications requiring tampon use. This choice is irrelevant to the medication’s administration or side effect profile.

Choice A reason: Palpitations may indicate electrolyte imbalances, like hypokalemia, a serious side effect of hydrochlorothiazide, a thiazide diuretic. It increases potassium excretion, disrupting cardiac electrical activity, potentially causing arrhythmias. Withholding the dose and notifying the provider is critical to prevent life-threatening cardiac complications, requiring urgent electrolyte assessment.

Choice B reason: Nervousness is a vague symptom not typically linked to hydrochlorothiazide’s side effects. It may reflect anxiety or other unrelated issues, not necessitating immediate drug cessation. Electrolyte imbalances or hypotension are more concerning, making this choice less urgent for withholding the medication.

Choice C reason: Nausea is a common, non-specific side effect of many medications, including hydrochlorothiazide, but is not severe enough to warrant withholding the dose. It may resolve or be managed symptomatically. More critical side effects, like electrolyte imbalances, take precedence, making this choice incorrect.

Choice D reason: Anorexia is not a primary concern with hydrochlorothiazide. While it may occur with diuretic-induced dehydration, it is less urgent than cardiac symptoms like palpitations. This symptom does not directly indicate a life-threatening side effect, so withholding the drug is not immediately necessary.