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The document includes a letter to the editor discussing a case where a patient experienced a sudden marked telogen effluvium, which is a form of temporary hair loss, five months after stopping oral minoxidil and propranolol and starting captopril and labetalol for hypertension. The patient's hair regrew within three months while still on captopril and labetalol. The letter notes that beta blockers like propranolol have been associated with hair loss, but the regrowth of hair while on labetalol suggests that beta blockers were unlikely the cause in this case. Captopril has also been reported to cause reversible hair loss. The patient had body hair growth likely due to oral minoxidil, which is known to cause hypertrichosis in about 70% of patients. The exact mechanism of minoxidil-induced hair growth is not determined, but it is suggested that oral minoxidil might prolong anagen phase in scalp hairs. The author, Elise A. Olsen, M.D., expresses uncertainty about the exact cause of the patient's hair loss but suggests that undisclosed stress might be a potential cause.