Rhinocon is usually taken for how long can not be taken again at present there is no clear rules, should be taken according to medical advice. Rhinocon is a proprietary Chinese medicine containing chlorpheniramine maleate, mainly for the treatment of acute and chronic rhinitis and allergic rhinitis, a course of treatment is usually half a month, usually after half a month by the doctor according to the specific condition and then determine whether to take again, but a long period of time may occur such as sleepiness, drowsiness, thirst, constipation aggravation and liver and kidney function impairment and other adverse reactions. If accompanied by bladder neck obstruction, hyperthyroidism, glaucoma, hypertension and prostate hypertrophy may be taken for a shorter period of time, and should be discontinued at any time if aggravation of the original disease occurs. Rhinoceros should be taken under the guidance of a doctor, found that the discomfort promptly to the regular hospital.