How to take histahive. Talk to your doctor or pharmacist before taking Histahive if you 180 mg of fexofenadine hydrochlorideequivalent of 168mgof fexofenadine. Fexofenadine Hydrochloride. Have or ever had heart problems, as fexofenadine, like other antihistamines may cause your heart to beat faster (tachycardia) or you feel your heart beating (palpitation).
eBay