Drug-related alopecia.

Drugs and chemicals are capable of producing a wide spectrum of hair loss, ranging from barely detectable shedding to frank, irreversible baldness. Agents may act directly or indirectly upon the follicle, but in either case, diagnosis of subtle alopecia can be difficult. General aspects of the clinical and research problems have been discussed, and 40 drugs and drug classes that have been linked to hair disturbances have been reviewed.