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Phenergan is an antihistamine. It blocks the effects of the naturally occurring chemical histamine in your body.
Phenergan is used to treat allergy symptoms such as itching, runny nose, sneezing, itchy or watery eyes, hives, and itchy skin rashes.
Phenergan also prevents motion sickness, and treats nausea and vomiting or pain after surgery. It is also used as a sedative or sleep aid.
Phenergan may also be used for other purposes not listed in this medication guide.
Stop using Phenergan and call your doctor at once if you have twitching or uncontrollable movements of your eyes, lips, tongue, face, arms, or legs. These could be early signs of dangerous side effects. Phenergan should not be given to a child younger than 2 years old. Phenergan 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. Phenergan can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert. Avoid drinking alcohol, which can increase some of the side effects of Phenergan. There are many other medicines that can interact with Phenergan. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.
Phenergan should not be given to a child younger than 2 years old. Phenergan 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. Do not use Phenergan if you have severe asthma, emphysema, or other breathing problem, or if you are allergic to Phenergan or other phenothiazines such as chlorpromazine (Thorazine), fluphenazine (Permitil), perphenazine (Trilafon), prochlorperazine (Compazine, Compro), thioridazine (Mellaril), or trifluoperazine (Stelazine).
If you have certain conditions, you may need a dose adjustment or special tests to safely use Phenergan. Before you take Phenergan, tell your doctor if you have:
a history of seizures;
heart disease or high blood pressure;
severe asthma, emphysema, chronic obstructive pulmonary disease (COPD) or other breathing problem;
sleep apnea (breathing stops during sleep);
a stomach ulcer or digestive obstruction;
bone marrow depression;
adrenal gland tumor (pheochromocytoma);
enlarged prostate or problems with urination;
low levels of calcium in your blood (hypocalcemia); or
if you have ever had a serious side effect while using Phenergan or any other phenothiazine.
FDA pregnancy category C. It is not known whether Phenergan is harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether Phenergan passes into breast milk or if it could harm a nursing baby. Do not use Phenergan without telling your doctor if you are breast-feeding a baby. Older adults may be more likely to have side effects from Phenergan.
See also: Pregnancy and breastfeeding warnings (in more detail)
Take Phenergan exactly as prescribed by your doctor. Do not take it in larger amounts or for longer than recommended. Follow the directions on your prescription label.
Your doctor may occasionally change your dose to make sure you get the best results from this medication.
Phenergan can be taken with or without food or milk.
Measure liquid medicine with a marked measuring spoon or medicine cup, not with a regular table spoon. If you do not have a dose-measuring device, ask your pharmacist for one.
Call your doctor if your symptoms do not improve, or if they get worse while taking Phenergan.
This medication can cause you to have unusual results with certain medical tests. Tell any doctor who treats you that you are using Phenergan.
Store this medication at room temperature away from moisture, heat, and light.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.
Seek emergency medical attention if you think you have used too much of this medicine. Overdose symptoms may include severe drowsiness, dizziness, dry mouth, large pupils, flushing, nausea, vomiting, shallow breathing, and fainting.
Phenergan can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and 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. Avoid drinking alcohol. It can increase some of the side effects of Phenergan. Avoid exposure to sunlight or tanning beds. Phenergan can make your skin more sensitive to sunlight, and a sunburn may result. Wear sunscreen (SPF 15 or higher) and protective clothing if you must be outdoors.
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using Phenergan and call your doctor at once if you have any of these serious side effects:
twitching, or uncontrollable movements of your eyes, lips, tongue, face, arms, or legs;
tremor (uncontrolled shaking), drooling, trouble swallowing, problems with balance or walking;
feeling restless, jittery, or agitated;
high fever, stiff muscles, confusion, sweating, fast or uneven heartbeats, rapid breathing;
feeling like you might pass out;
pale skin, easy bruising or bleeding, fever, sore throat, flu symptoms;
decreased night vision, tunnel vision, watery eyes, increased sensitivity to light;
nausea and stomach pain, skin rash, and jaundice (yellowing of the skin or eyes);
urinating less than usual or not at all;
joint pain or swelling with fever, swollen glands, muscle aches, chest pain, vomiting, unusual thoughts or behavior, and patchy skin color; or
slow heart rate, weak pulse, fainting, slow breathing (breathing may stop).
Less serious Phenergan side effects may include:
dizziness, drowsiness, anxiety;
blurred vision, dry mouth, stuffy nose;
ringing in your ears;
weight gain, swelling in your hands or feet;
impotence, trouble having an orgasm; or
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 .
See also: Side effects (in more detail)
Cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression or anxiety can interact with Phenergan and cause medical problems or increase side effects. Tell your doctor if you regularly use any of these medicines.
Also tell your doctor if you are using any of the following medicines:
lithium (Eskalith, Lithobid);
atropine (Atreza, Sal-Tropine), belladonna (Donnatal, and others), benztropine (Cogentin), dimenhydrinate (Dramamine), methscopolamine (Pamine), or scopolamine (Transderm-Scop);
blood pressure medication such as guanadrel (Hylorel), guanethidine (Ismelin), propranolol (Inderal), and others;
a blood thinner such as warfarin (Coumadin);
bronchodilators such as ipratropium (Atrovent) or tiotropium (Spiriva);
bladder or urinary medications such as oxybutynin (Ditropan, Oxytrol), solifenacin (Vesicare), and others;
an MAO inhibitor such as isocarboxazid (Marplan), tranylcypromine (Parnate), phenelzine (Nardil), or selegiline (Eldepryl, Emsam); or
medicines to treat Parkinson's disease, restless leg syndrome, or pituitary gland tumor (prolactinoma); or
medicine to treat stomach ulcer or irritable bowel syndrome, such as dicyclomine (Bentyl), glycopyrrolate (Robinul), hyoscyamine (Anaspaz, Cystospaz, Levsin, and others), mepenzolate (Cantil), or propantheline (Pro-Banthine).
This list is not complete and there are many other medicines that can interact with Phenergan. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.
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