hi, welcome to healthcaremagic forum warning while taking doxycycline,be aware that antacids, calcium supplements(diary products), iron products, and laxatives containing magnesium interfere with doxycycline, making it less effective. Take doxycycline 1 hour before or 2 hours after antacids (including sodium bicarbonate), calcium supplements, and laxatives containing magnesium. Take doxycycline 2 hours before or 3 hours after iron preparations and vitamin products that contain iron.tell your doctor if you have or have ever had diabetes or kidney or liver disease.tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking doxycycline, call your doctor immediately. Doxycycline can harm the fetus.if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking doxycycline.plan to avoid unnecessary or prolonged exposure to sunlight and to wear protective clothing, sunglasses, and sunscreen. Doxycycline may make your skin sensitive to sunlight.hope that it ll help you