-antacids
-birth control pills
-methoxyflurane
-other antibiotics like penicillin
-some multivitamins
-warfarin

They need to know if you have any of these conditions:
-kidney disease
-liver disease
-an unusual or allergic reaction to demeclocycline, or other tetracycline antibiotics, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Tell your doctor or health care professional if your symptoms do not improve or if they get worse.

This medicine can make you more sensitive to the sun. Keep out of the sun. If you cannot avoid being in the sun, wear protective clothing and use sunscreen. Do not use sun lamps or tanning beds/booths.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells.

Birth control pills may not work properly while you are taking this medicine. Talk to your doctor about using an extra method of birth control.

If you are being treated for a sexually transmitted disease, avoid sexual contact until you have finished your treatment. Your sexual partner may also need treatment.

Avoid taking antacids containing aluminum, calcium or magnesium, and iron-containing products for 2 hours before and after taking a dose of this medicine.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date. Do not take this medicine after it has expired, it can make you ill.