Toviaz Drug Interactions

by on April 18, 2012

Many common prescription medications can interact with Toviaz, increasing a patient’s risk for allergic reaction or other serious side effects. When discussing Toviaz with your doctor, be sure to disclose any and all of the medications that you are taking.

These medications may include potassium tablets/capsules, drugs that can induce dry mouth or constipation such as atropine/scopolamine, diphenhydramine, dicyclomine and belladonna alkaloids. Likewise, other medications can affect the excretion of fesoterodine including azole antifungals (ketoconazole, itraconazole), macrolide antibiotics (clarithromycin) and some drugs to treat seizures (carbamazepine, St John’s wort). Please keep in mind that this list is not complete.

It is also important to tell your doctor if you are taking medications that cause drowsiness such as: several antihistamines (diphenhydramine), anti-anxiety drugs (diazepam), anti-seizure drugs (phenobarbital), medicines for sleep (zolpidem), muscle relaxants, narcotic pain relievers (codeine) and psychiatric medicines (amitriptyline).

It is advisable to check the labels of the medicines you use frequently, including those to treat allergy, cough-cold because they may contain ingredients that can cause side-effects such as drowsiness, constipation or blurred vision. Consult your doctor about the safety of those products.

The following medications and types of drugs may produce a negative reaction when used with Toviaz or fesoterodine:

  • Nizoral (ketoconazole)
  • Biaxin (clarithromycin)
  • Cardizem, Cartia XT or Dilacor XR (diltiazem)
  • ERY-C or Ery-Tab (erythromycin)
  • Sporanox (itraconazole)
  • Crixivan (indinavir)
  • Viracept (nelfinavir)
  • Norvir (ritonavir)
  • Atrovent (ipratropium)
  • Calan, Covera-HS, Isoptin SR or Verelan (verapamil)
  • Medications for Parkinson's disease
  • Medications for irritable bowel disease
  • Ulcer medications
  • Motion sickness medications