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What side effects does Guanfacine (Tenex) cause?

Common side effects of guanfacine include: fatigue, headaches, weakness, dry mouth, irritability, lowered appetite, decreased sexual ability, constipation, nausea, vomiting, drowsiness and dizziness. See your doctor if these are severe or persistent. Hallucinations have been reported in children taking Tenex for ADHD. Some side effects of guanfacine are serious. Call your doctor right away if you experience the following: pounding in the chest; changes in heartbeat; inability to have sex; blurred vision; rash or fainting. Some people may have an allergic reaction to guanfacine. Seek emergency medical treatment right away if you develop: hives, an itchy rash, difficulty breathing, chest tightness or swelling of the face, lips, tongue, throat, mouth and eyes.

Based on information from iGuard.org, a free medication monitoring service, 48% of patients experience side effects while taking Guanfacine (Tenex). Some of the side effects reported by iGuard members include: Constipation, Drowsiness, Dryness, Muscle Pain/Cramps, Insomnia, Fatigue, Tinnitus, and Tremor. Please follow up with your doctor or other healthcare provider if you are experiencing any symptoms that worsen or do not go away.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.