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Histex Syrup

Name of the generic: triprolidine Triprolidine trye-PROE-li deen “Treprolidine
Names of brands: Histex PD Drops, Histex Syrup, M-Hist PD, PediaClear PD, Histex, Vanaclear PD, Vanahist PD
Drug class: Antihistamines

What is Histex Syrup?

Histex Syrup is an antihistamine that can be employed to address sneezing, nasal itching, runny throat and nose, and watery or itchy eyes that are caused by allergies like hay fever. Histex Syrup can also be used for other purposes not covered in this medication guide.

Side effects of Histex Syrup

See a doctor immediately. If you are experiencing symptoms that indicate an allergic reaction, such as hives, difficulty breathing, and swelling of your lips, face, or tongue, Histex Syrup could cause serious adverse side effects. Do not use Histex Syrup and consult your physician immediately. If you suffer from:

  • It is difficult or painful to urinate.

Common adverse consequences of Histex Syrup can include:

  • Dizziness, drowsiness;
  • Blurred vision
  • Dry mouth, nose, dry mouth, or throat;
  • Constipation;
  • An increase in urination; or
  • Being anxious or becoming restless (especially when it is a child).

This isn't a complete list of possible side effects, and other side effects could occur. Consult your physician for advice regarding medical effects. You can report any adverse reactions to the FDA at 1-800-FDA-1088.

Related drugs

Prednisone, Hydroxyzine, Fluticasone Nasal, Cetirizine for Ophthalmic Use, Loratadine, Cetirizine, and Dexamethasone Eye Drops


Follow all the instructions on the label of your medication and on the label of your package. Inform your health care providers about your allergies, medical conditions, and any other medications you take.

Antihistamines should not be used as a medication to make your child restless.

Before taking this medication

You shouldn't apply Histex Syrup if you are sensitive to it.

Ask your doctor or pharmacist to determine if the Histex Syrup is safe to use if:

  • A breathing disorder, like chronic bronchitis or emphysema;
  • Glaucoma; or
  • An enlarged prostate and urinary issues.

Talk to your doctor prior to taking this medication if you are breastfeeding or pregnant.

This medication may contain phenylalanine. Make sure to read the label on the medicine if you suffer from the condition known as phenylketonuria (PKU).

How to take Histex Syrup?

Take exactly as indicated on the label or as directed by your physician. The cold and cough medication is intended to be used for a short time until symptoms are gone. Follow the instructions on the medication label regarding the administration of cold or cough medicine to children. Don't use the medication solely to help a child fall asleep. Death can occur due to the use of cold or cough medications in infants and young children. It is important to chew the tablet thoroughly before you take it in.

Take care when measuring liquid medicines. Use the dosing needle provided or a dose-measuring device (not the kitchen spoon). Contact your physician if your symptoms don't get better after 7 days or if you experience trouble with your fever, skin rash, or headaches.

If you are in need of surgical intervention or other medical examinations, inform the doctor prior to your appointment in the event that you've taken this medication within the last few days. Keep the medicine at room temperature, far from heat and moisture. Don't allow the liquid medicine to cool down.

Do I be concerned if I miss a dose?

Because Histex Syrup is used when required, you might not be on a regular dosing schedule. Don't miss any doses when it's time to take the next dose. Do not take two doses at once.

What will happen if I take excessively?

Get medical attention in an emergency or contact the poison help line at 1-800-222-1222.

What should be avoided?

Avoid driving or engaging in hazardous activities until you are aware of the effects of Histex Syrup on your The way you react could be impaired.

Drinking alcohol can trigger certain adverse effects associated with trirolidine.

Talk to your doctor or pharmacist prior to using any other cold or cough medications that contain similar components.

Avoid becoming too hot or dehydrated in the heat of exercise or temperatures. Histex Syrup can decrease sweating and make you more vulnerable to heat stroke.

Interaction with other drugs

Do not take this medication in conjunction with other medications that can make you drowsy or slow the rate of breathing (such as opioids, a muscle relaxer, or medicines to treat anxiety and seizures). Talk to your doctor or pharmacist prior to using any other medicine, including prescription or over-the-counter medications, vitamins, and herbal remedies. There are many possible interactions between drugs that are included in this guide to medication.