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Tenex Oral

Generic Name: GUANFACINE - ORAL
Pronounced: (GWAN-fuh-seen)

Tenex Oral Interactions

Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of:

  • phenobarbital
  • phenytoin
  • other blood pressure medications (e.g., beta blockers such as propranolol, diuretics such as hydrochlorothiazide, calcium channel blockers such as nifedipine or amlodipine, ACE inhibitors such as lisinopril, among others)


Before using this medication, tell your doctor or pharmacist if you use any other prescription and nonprescription products that cause drowsiness such as certain antihistamines (e.g., diphenhydramine), anti-seizure drugs (e.g., carbamazepine), medicine for sleep or anxiety (e.g., alprazolam, diazepam, zolpidem), muscle relaxants (e.g., methocarbamol), narcotic pain relievers (e.g., codeine), psychiatric medicines (e.g., chlorpromazine, risperidone, trazodone).

Check the labels on all your medicines (e.g., cough-and-cold products) because they may contain ingredients that can worsen blood pressure control if used with this medication (e.g., phenylephrine, pseudoephedrine). Ask your pharmacist about using those products safely.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

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