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Tenex

Generic Name: Guanfacine Tablets (GWAHN fa seen)
Brand Name: Tenex

Medically reviewed on July 4, 2018

Uses of Tenex:

  • It is used to treat high blood pressure.
  • It may be given to you for other reasons. Talk with the doctor.

What do I need to tell my doctor BEFORE I take Tenex?

  • If you have an allergy to guanfacine or any other part of Tenex (guanfacine tablets).
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you are taking another drug that has the same drug in it.

This is not a list of all drugs or health problems that interact with Tenex (guanfacine tablets).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Tenex (guanfacine tablets) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Tenex?

  • Tell all of your health care providers that you take Tenex (guanfacine tablets). This includes your doctors, nurses, pharmacists, and dentists.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how Tenex (guanfacine tablets) affects you.
  • To lower the chance of feeling dizzy or passing out, rise slowly if you have been sitting or lying down. Be careful going up and down stairs.
  • Check blood pressure and heart rate as the doctor has told you. Talk with the doctor.
  • Avoid drinking alcohol while taking Tenex (guanfacine tablets).
  • Talk with your doctor before you use other drugs and natural products that slow your actions.
  • If you are taking Tenex (guanfacine tablets) and have high blood pressure, talk with your doctor before using OTC products that may raise blood pressure. These include cough or cold drugs, diet pills, stimulants, ibuprofen or like products, and some natural products or aids.
  • Tell your doctor if you have too much sweat, fluid loss, throwing up, or loose stools. This may lead to low blood pressure.
  • Be careful in hot weather or while being active. Drink lots of fluids to stop fluid loss.
  • Do not stop taking Tenex (guanfacine tablets) all of a sudden without calling your doctor. High blood pressure and fast heartbeat can happen if Tenex (guanfacine tablets) is stopped all of a sudden. Other signs of withdrawal like headache, shakiness, or feeling agitated, confused, or nervous can also happen. If these get worse and are not treated, it could lead to a very bad health problem with signs like feeling very sleepy or tired, very bad headache, throwing up, change in eyesight, or seizures. If you need to stop Tenex (guanfacine tablets), you will want to slowly stop it as ordered by your doctor.
  • Tell your doctor if you have been throwing up and cannot take Tenex (guanfacine tablets).
  • If your doctor has told you to lower your dose or slowly stop taking Tenex (guanfacine tablets), you will need to check your blood pressure and heart rate closely. Follow what your doctor has told you to do.
  • Use with care in children. Talk with the doctor.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Tenex (guanfacine tablets) while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

How is this medicine (Tenex) best taken?

Use Tenex (guanfacine tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • Take with or without food.
  • To gain the most benefit, do not miss doses.
  • Keep taking Tenex (guanfacine tablets) as you have been told by your doctor or other health care provider, even if you feel well.

What do I do if I miss a dose?

  • Take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.

See also: Dosage Information (in more detail)

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Very bad dizziness or passing out.
  • Slow heartbeat.
  • A heartbeat that does not feel normal.
  • Feeling very sleepy.
  • Not able to get or keep an erection.

What are some other side effects of Tenex?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

  • Dizziness.
  • Feeling sleepy.
  • Dry mouth.
  • Feeling tired or weak.
  • Headache.
  • Hard stools (constipation).
  • Upset stomach.
  • Not able to sleep.
  • Belly pain.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

See also: Side effects (in more detail)

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Tenex?

  • Store at room temperature.
  • Protect from light.
  • Store in a dry place. Do not store in a bathroom.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

Consumer information use

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else's drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about Tenex (guanfacine tablets), please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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