Tell your doctor/Pharmacist your medical history of, Obstructive lung disease, Severe asthma, Anemia, Vitamin B12 deficiency, Kidney disease, Liver disease. During pregnancy, this medication should be used only when clearly needed. It can cause changes in the menstrual cycle (promote ovulation) and increase the risk of becoming pregnan, Consult your doctor or pharmacist about the use of reliable birth control while using this medication. It passes into breast milk in small amounts. Consult your doctor before breast-feeding.