• On Tuesday, the FDA approved phenylpropanolamine hydrochloride chewable tablets for the control of urinary incontinence due to a weakening of the muscles that control urination (urethral sphincter hypotonus) in dogs. This is the first generic phenylpropanolamine hydrochloride chewable tablets for dogs. Phenylpropanolamine Hydrochloride chewable tablets contain the same active ingredient (phenylpropanolamine hydrochloride) in the same concentration and dosage form as the approved brand name drug product, Proin chewable tablets, which were first approved on Aug. 4, 2011.