- Clonidine DESCRIPTION NewsLinks Tablet Clonidine hydrochloride USP is a centrally acting antihypertensive 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 in Catapres are colloidal silicon dioxide, corn starch, dibasic calcium phosphate, FD&C Yellow No.www.rxlist.com/cgi/generic/clonidin.htm
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