Phenergan is a prescription antihistamine medication. This means that it works to reduce the effects of histamine, a chemical produced in the body. The generic name for Phenergan is promethazine. Phenergan can treat allergies, motion sickness and post-surgical complications like nausea and pain. It is also a sedative.

Mild Side Effects

Phenergan may cause some mild side effects. These may include weight gain, dry mouth, blurred vision, dizziness, anxiety, drowsiness, a ringing in the ears, stuffy nose, swelling of the feet or hands, constipation and impotence.

Severe Side Effects

Some of the more serious side effects of Phenergan may include slow breathing or stopped breathing, slow heart rate, fainting, slow pulse, seizures, fever or flu symptoms, tunnel vision, hallucinations, nausea, stomach pain and uncontrollable movements. Get medical help immediately if you have any of these side effects.

Pregnancy

According to Drugs.com, the FDA has classified Phenergan in the pregnancy category C. This means that it is unknown if the drug will harm an unborn baby or a nursing baby.

Warning

Phenergan may interact with other drugs (such as blood pressure drugs, blood-thinners or lithium) or pre-existing medical conditions (such as sleep apnea, liver or kidney disease). Additionally, consuming alcohol may worsen side effects.

Considerations

If you are an older adult, you are at an increased risk of side effects from taking this medication. Additionally, use special care when giving this drug to children. Children under two should never take Phenergan, as it may cause respiratory problems or death.

Source:

Drugs.com: Phenergan

RxList: Phenergan

More Information:

The Mayo Clinic: Promethazine