Two of the hair loss medications have been successful in promoting hair growth according to scientific research – the results have been proved. One of these medications is for external use, and the other is for internal use – it is taken orally. This pill (oral medication) stops the secretion of the DHT hormone from the male prostate. The DHT hormone is a strong derivative of the male testosterone. It has been observed that about 1% of those who take the medication experience some side effects like sexual dysfunctions.