Guanfacine ER (Intuniv) Side Effects

Possible side effects of guanfacine ER are listed below. Call your doctor if the adverse effects are severe or continue after a few days.

• Tiredness
• Weakness
• Headache
• Dry mouth
• Irritability
• Decreased appetite
• Stomach pain
• Constipation
• Nausea
• Vomiting
• Reduced sexual ability

Some of the side effects of guanfacine ER are more serious. Call your doctor right away or seek emergency medical attention if you develop the following symptoms:

• Skin rash
• Slowed heart rate
• Blurred vision
• Fainting

The above list may not include all the potential side effects of guanfacine ER. Contact your healthcare provider if the adverse reactions are unusual or severe or they do not get better over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Guanfacine ER (Intuniv) Overdose: In case of an overdose of guanfacine ER, call your doctor immediately. You can also call your local poison control center or the national poison control center at 1-800-222-1222. Overdose symptoms may include drowsiness, dizziness, blurred vision, small pupils, low energy, slow heart rate, and fainting.

Source: FDA