Stop intake if skin rash, & signs of hypersensitivity appears. Patients w/ asthma; ischemic heart disease & those w/ risk factors for heart disease, HTN, hyperlipidemia, diabetes, smoking & patients w/ peripheral arterial disease. Should not be used in patients w/ ischemic heart disease, peripheral arterial disease, or cerebrovascular disease. May affect ability to drive & use machines. Potential for GI (gastric & liver) & renal toxicities. Avoid in patients w/ severe hepatic impairment. Stop immediately if persistently abnormal liver enzyme values are seen. Do not use during pregnancy & lactation.