Male pattern baldness is very common among middle-aged men and many men fret over it.Many men use various medicines to treat it or resort to techniques like hair weaving to hide their balding scalp. It is believed that these medicines are harmless and have minimal side effects. But a new study claims otherwise. It says that certain common drugs prescribed for those suffering from male pattern hair loss - known as alopecia - and benign prostate enlargement (BPH) may lead to adverse sexual side effects such as loss of libido or erectile dysfunction. Read: Do you have male pattern baldness?