Hello,
Doryx or doxycycline is often used as an
acne treatment but hair loss is not a reported side effect. Causes of hair fall could be like nutrients and proteins deficiency in the hair cells, emotional or physical stress, hormonal imbalances, dandruff, and serious illness like a tumors, infectious disease and Alopecia areata.In your case it can be stress induced. If there is underlying disease or nutritional deficiency .