The drugs that often cause drowsiness are the following categories: first, anti-epileptic drugs, these drugs are mainly phenytoin sodium, sodium phenobarbital, etc. These drugs have an anti-epileptic effect after injection, and at the same time have the role of promotion and sedation. Second, is the anti-allergic drugs, this class of drugs is mainly represented by paracetamol, after oral intake can appear drowsy, drowsy and other performance. So this class of drugs instructions, prohibit driving this situation. Third, is a class of drugs for colds, this drug has fenugreek ingredients so easy to cause drowsiness, drowsiness and other situations. In addition, commonly used is a sedative class of drugs, can cause drowsiness, itself the role of this drug is sedation to promote sleep, such as Valium, Flunitrazepam, Gaglodin, etc. This is a common drug for drowsiness. The above content is for reference only, the specific medication, treatment guidance, please subject to the doctor’s interview.