"Nov. 1, 2012 -- Having even mildly elevated blood pressure at midlife prematurely ages the brain, a new study shows.
Researchers say the early changes seen with higher blood pressure may set the stage for problems with thinking, memor"...
(clonidine hydrochloride) Oral Antihypertensive Tablets of 0.1, 0.2 and 0.3 mg , USP
Catapres® (clonidine hydrochloride, USP) is a centrally acting alpha-agonist hypotensive agent available as tablets for oral administration in three dosage strengths: 0.1 mg, 0.2 mg and 0.3 mg. The 0.1 mg tablet is equivalent to 0.087 mg of the free base.
The inactive ingredients are colloidal silicon dioxide, corn starch, dibasic calcium phosphate, FD&C Yellow No. 6, gelatin, glycerin, lactose, and magnesium stearate. The Catapres 0.1 mg tablet also contains FD&C Blue No.1 and FD&C Red No.3.
Clonidine hydrochloride is an imidazoline derivative and exists as a mesomeric compound. The chemical name is 2-(2,6-dichlorophenylamino)-2-imidazoline hydrochloride. The following is the structural formula:
C9H9Cl2N3 · HCl Mol. Wt. 266.56
Clonidine hydrochloride is an odorless, bitter, white, crystalline substance soluble in water and alcohol.
What are the possible side effects of clonidine (Catapres, Kapvay, Kapvay Dose Pack)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
- fast or pounding heartbeats, tremors;
- a very slow heart rate (fewer than 60 beats per minute);
- feeling short of breath, even with mild exertion;
- swelling, rapid weight gain;
- confusion, hallucinations;
- flu symptoms;
- urination problems; or
- feeling like you might pass out.
What are the precautions when taking clonidine (Catapres)?
Before taking clonidine, tell your doctor or pharmacist if you are allergic to it (including having a rash while using clonidine patches); 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, heart rhythm problems (such as slow/irregular heartbeat, second- or third-degree atrioventricular block).
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.
Before having surgery, tell your doctor...
Last reviewed on RxList: 1/31/2017
This monograph has been modified to include the generic and brand name in many instances.
Additional Catapres 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.
Get tips on handling your hypertension.