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Frequently Asked Questions
Promethazine should not be used in a child younger than 2 years old. Promethazine can cause severe breathing problems or death in a child younger than 2.
Promethazine is in a group of drugs called phenothiazines (FEEN-oh-THYE-a-zeens). It works by changing the actions of chemicals in your brain. Promethazine also acts as an antihistamine. It blocks the effects of the naturally occurring chemical histamine in your body.
Promethazine is used to treat allergy symptoms such as itching, runny nose, sneezing, itchy or watery eyes, hives, and itchy skin rashes.
Promethazine also prevents motion sickness, and treats nausea and vomiting or pain after surgery. It is also used as a sedative or sleep aid.
Promethazine is not for use in treating symptoms of asthma, pneumonia, or other lower respiratory tract infections.
Promethazine may also be used for other purposes not listed in this medication guide.
Promethazine should not be used in a child younger than 2 years old. Promethazine can cause severe breathing problems or death in a child younger than 2. Carefully follow your doctor's instructions when giving this medicine to a child of any age.
You should not use this medicine if you are allergic to promethazine or to similar medicines such as chlorpromazine, fluphenazine, mesoridazine, perphenazine, prochlorperazine, thioridazine, or trifluperazine.
To make sure rectal promethazine is safe for you, tell your doctor if you have:
- asthma, chronic obstructive pulmonary disease (COPD), sleep apnea, or other breathing disorder;
- a sulfite allergy;
- a history of seizures;
- a weak immune system (bone marrow depression);
- enlarged prostate or problems with urination;
- stomach ulcer or obstruction;
- heart disease or high blood pressure;
- liver disease;
- adrenal gland tumor (pheochromocytoma);
- low levels of calcium in your blood (hypocalcemia); or
- if you have ever had a serious side effect while using promethazine or any other phenothiazine.
FDA pregnancy category C. It is not known whether promethazine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medicine.
It is not known whether promethazine passes into breast milk or if it could harm a nursing baby. You should not breast-feed while using this medicine.
Follow all directions on your prescription label. Do not use this medicine in larger or smaller amounts or for longer than recommended.
This medicine comes with patient instructions for using the rectal suppository. Follow these directions carefully. Ask your doctor or pharmacist if you have any questions.
Do not take promethazine by mouth. It is for use only in your rectum.
Try to empty your bowel and bladder just before using the promethazine suppository.
Remove the outer wrapper from the suppository before inserting it. Avoid handling the suppository too long or it will melt in your hands.
For best results from the suppository, lie down after inserting it and hold in the suppository for a few minutes. The suppository will melt quickly once inserted and you should feel little or no discomfort while holding it in. Avoid using the bathroom just after you have inserted the suppository.
Call your doctor if your symptoms do not improve, or if they get worse while using promethazine.
This medicine can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using rectal promethazine.
Store the rectal suppositories in the refrigerator but do not allow them to freeze.
Use the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not use extra medicine to make up the missed dose.
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include overactive reflexes, loss of coordination, severe drowsiness or weakness, fainting, dilated pupils, weak or shallow breathing, or seizure (convulsions).
This medicine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.
Drinking alcohol can increase certain side effects of promethazine.
Avoid exposure to sunlight or tanning beds. Promethazine can make you sunburn more easily. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors.
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using promethazine and call your doctor at once if you have:
- severe drowsiness, weak or shallow breathing;
- a light-headed feeling, like you might pass out;
- confusion, agitation, hallucinations, nightmares;
- seizure (convulsions);
- fast or slow heartbeats;
- jaundice (yellowing of the skin or eyes);
- uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement);
- easy bruising or bleeding (nosebleeds, bleeding gums);
- sudden weakness or ill feeling, fever, chills, sore throat, mouth sores, red or swollen gums, trouble swallowing; or
- severe nervous system reaction--very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.
Side effects such as confusion and severe drowsiness may be more likely in older adults.
Common side effects may include:
- drowsiness, dizziness;
- ringing in your ears;
- double vision;
- feeling nervous;
- dry mouth; or
- tired feeling, sleep problems (insomnia).
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
Using this medicine with other drugs that make you sleepy or slow your breathing can cause dangerous or life-threatening side effects. Ask your doctor before using promethazine with a sleeping pill, narcotic pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.
Other drugs may interact with promethazine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
Your pharmacist can provide more information about rectal promethazine.
|Brand Name Examples||Supplied As||Strength|
|Phenergan||solution||25 mg/mL50 mg/mL|
|Promethegan||suppository||12.5 mg25 mg50 mg|
|Generic Examples||Supplied As||Strength|
|Promethazine Hydrochloride||solution||25 mg/mL50 mg/mL|
|syrup||6.25 mg/5 mL|
|suppository||12.5 mg25 mg50 mg|
|tablet||12.5 mg25 mg50 mg|
|Promethazine Hydrochloride Novaplus||solution||25 mg/mL50 mg/mL|