How is spironolactone used in hirsutism and what are key safety considerations?

• A. As an antiandrogen, spironolactone reduces androgen activity; monitor for hyperkalemia, menstrual irregularities, and pregnancy risks; use with caution in women of childbearing potential.
• B. Spironolactone stimulates estrogen production to reduce hair growth.
• C. Spironolactone is a topical diuretic with no systemic effects.
• D. Spironolactone is the primary treatment for hair loss due to thyroid disease.

Answer: (A)

Spironolactone works in hirsutism because it acts as an antiandrogen, blocking the effect of androgens at the hair follicle and, to some extent, reducing androgen production. By diminishing androgen activity, hair growth in androgen-sensitive areas slows and may gradually lessen over several months of therapy. This makes it useful for conditions with excess androgens, such as PCOS, where reducing androgen influence helps improve hirsutism.

Safety is a key part of its use. Spironolactone is a potassium-sparing diuretic, so it can raise plasma potassium levels (hyperkalemia), especially in people with kidney impairment, diabetes, elderly patients, or when taken with other potassium-raising medications like ACE inhibitors or ARBs. Regular monitoring of potassium and renal function is important. It can cause menstrual irregularities and breast tenderness due to its antiandrogen effects. Because of potential effects on a developing fetus, it is contraindicated in pregnancy, and women of childbearing potential should use effective contraception while taking it. These safety considerations guide its use and help explain why it’s prescribed with careful monitoring rather than as a universal hair-growth remedy.