Medication and Side effects

So as a person.. who doesn't suffer from any serious illness(Thank God ) , it's hard for me to know exactly how patients feel while taking legal drugs (Medication). I know for sure that there are side effects , ranging from mild to extreme ,and from what I've heard and read they can be serious ,let's take Roaccutine, a common drug that's used for treating severe and sometimes mild acne , they say that it causes dryness and sometimes depression that would go away when the medication stops or wont and as well as hair loss and hair thining and other things , other drugs treated for mental disorders can cause other side effects , some of them are weight gain others are increased dream activity and insomnia , anyways you should always thank God for the healthy body .