What Phenergan are used for ? Phenergan are used to treat the following conditions:

• For short term use: to treat adults with difficulty sleeping.
• To treat allergic conditions such as hay fever or rashes
• To treat or stop you feeling sick or being sick such as travel sickness.

It works by blocking a natural substance that your body makes during an allergic reaction. It also works directly on the brain to help you feel more relaxed.