Any specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. Alcohol or marijuana can make you more dizzy or drowsy. It is important to continue taking this medication even if you feel well. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. To relieve dry mouth, suck on (sugarless) hard candy or ice chips, chew (sugarless) gum, drink water, or use a saliva substitute. Before taking Doxepin tell your doctor or chemist if you are allergic to it; or if you have other allergies.