promethazine (oral) (cont.)
What happens if I miss a dose (Pentazine, Phenergan)?
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.
What happens if I overdose (Pentazine, Phenergan)?
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.
What should I avoid while taking oral promethazine (Pentazine, Phenergan)?
Promethazine 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 promethazine.
Avoid exposure to sunlight or tanning beds. Promethazine 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.
What other drugs will affect oral promethazine (Pentazine, Phenergan)?
Cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression or anxiety can interact with promethazine 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 promethazine. 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.
Where can I get more information?
Your pharmacist can provide more information about oral promethazine.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
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