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(guanfacine) Extended-release Tablets
INTUNIV® is a once-daily, extended-release formulation of guanfacine hydrochloride (HCl) in a matrix tablet formulation for oral administration only. The chemical designation is N-amidino-2-(2,6-dichlorophenyl) acetamide monohydrochloride. The molecular formula is C9H9Cl2 N3O•HCl corresponding to a molecular weight of 282.55. The chemical structure is:
Guanfacine HCl is a white to off-white crystalline powder, sparingly soluble in water (approximately 1 mg/mL) and alcohol and slightly soluble in acetone. The only organic solvent in which it has relatively high solubility is methanol ( > 30 mg/mL). Each tablet contains guanfacine HCl equivalent to 1 mg, 2 mg, 3 mg, or 4 mg of guanfacine base. The tablets also contain hypromellose, methacrylic acid copolymer, lactose, povidone, crospovidone, microcrystalline cellulose, fumaric acid, and glyceryl behenate. In addition, the 3mg and 4mg tablets also contain green pigment blend PB-1763.
What are the possible side effects of guanfacine (Intuniv, Tenex)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- fast or slow heart rate;
- pounding heartbeats, chest tightness;
- numbness or tingling; or
- feeling like you might pass out.
Less serious side effects may include:
- drowsiness, dizziness, tired feeling;
- dry mouth;
- stomach pain;
What are the precautions when taking guanfacine (Intuniv)?
Before taking guanfacine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease, fainting, blood pressure problems (both low or high), slow heart rate.
This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Avoid alcoholic beverages.
To reduce the risk of dizziness and fainting, avoid becoming dehydrated or overheated during exercise, especially...
Last reviewed on RxList: 9/9/2013
This monograph has been modified to include the generic and brand name in many instances.
Additional Intuniv Information
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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