Generic name: triprolidine [ trye-PROE-li-deen ]
Brand names: Histex, M-Hist PD, Vanaclear PD, Vanahist PD
Drug class: Antihistamines
What is M-Hist PD?
M-Hist PD is an antihistamine that is used to treat sneezing, runny nose, itchy nose and throat, and itchy or watery eyes caused by allergies such as hay fever.
M-Hist PD may also be used for purposes not listed in this medication guide.
Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
You should not use antihistamine medication to make a child sleepy.
Before taking this medicine
You should not use M-Hist PD if you are allergic to it.
Ask a doctor or pharmacist if M-Hist PD is safe to use if you have:
a breathing disorder such as chronic bronchitis or emphysema;
an enlarged prostate and urination problems.
Ask a doctor before using this medicine if you are pregnant or breastfeeding.
This medicine may contain phenylalanine. Check the medication label if you have phenylketonuria (PKU).
How should I take M-Hist PD?
Use exactly as directed on the label, or as prescribed by your doctor. Cold or cough medicine is only for short-term use until your symptoms clear up.
Always follow directions on the medicine label about giving cough or cold medicine to a child. Do not use the medicine only to make a child sleepy. Death can occur from the misuse of cough or cold medicines in very young children.
You must chew the chewable tablet before you swallow it.
Measure liquid medicine carefully. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon).
Call your doctor if your symptoms do not improve after 7 days, or if you have a fever, rash, or headaches.
If you need surgery or medical tests, tell the doctor ahead of time if you have taken this medicine within the past few days.
Store at room temperature away from moisture and heat. Do not allow liquid medicine to freeze.
What happens if I miss a dose?
Since M-Hist PD is used when needed, you may not be on a dosing schedule. Skip any missed dose if it's almost time for your next dose. Do not use two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking M-Hist PD?
Avoid driving or hazardous activity until you know how M-Hist PD will affect you. Your reactions could be impaired.
Drinking alcohol can increase certain side effects of triprolidine.
Ask a doctor or pharmacist before using other cough or cold medicines that may contain similar ingredients.
Avoid becoming overheated or dehydrated during exercise and in hot weather. M-Hist PD can decrease sweating and you may be more prone to heat stroke.
M-Hist PD side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
M-Hist PD may cause serious side effects. Stop using M-Hist PD and call your doctor at once if you have:
painful or difficult urination.
Common side effects of M-Hist PD may include:
dry mouth, nose, or throat;
increased urination; or
feeling nervous or restless (especially in children).
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What other drugs will affect M-Hist PD?
Avoid using M-Hist PD with other drugs that cause drowsiness or slow your breathing (such as opioid medicine, a muscle relaxer, or medicine for anxiety or seizures). Ask a doctor or pharmacist before using any other medication, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed in this medication guide.
More about M-Hist PD (triprolidine)
- Check interactions
- Compare alternatives
- Side effects
- Dosage information
- During pregnancy
- Drug class: antihistamines
- En español
Histex, Vanahist PD, Vanaclear PD
Related treatment guides
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.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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