Diphenhydramine is a drug that is often used for common colds, viral infections, itching, sneezing and other things. Diphenhydramine is considered a antihistamine and can create drowsiness. Sometimes the doctor describes Diphenhydramine so people can sleep when they are sick.

Side effects with Diphenhydramine include:

- Dry mouth
- Headache
- Sleepiness
- Dizziness
- Fatigue
- Prostrate enlarged
- Problems with urinating

When taking Diphenhydramine you should avoid:

- driving
- doing hazardous activities
- operating machinery
- use of alcohol

When using Diphenhydramine for sleeping at night you should take it 30 minutes before you go to bed with a glass of water. It is recommended that you take Diphenhydramine by cup or either a spoon to make sure that you get the proper amount of medication that the doctor prescribed. If you have a sensitive stomach having some crackers or a light snack might help to calm your stomach.