Prevacid (lansoprazole) is a medicine that works by decreasing the amount of acid produced in the stomach. It can be prescribed for the treatment of erosive esophagitis, ulcers and some other conditions of the kind. You must never take this medicine if you are allergic to its active ingredient - lansoprazole, as well as penicillin or macrolide antibiotics, such as clarithromycin or erythromycin. An allergic reaction is possible if you take this medicine anyway with the following symptoms displaying: hives, rash, trouble breathing or swallowing and swelling of your feet, hands and face. Seek emergency medical help if you get an allergic reaction. This medicine is considered to be very safe and highly efficient - not only can it be taken by people with a number of health conditions that may be contraindications for using other mediations of the kind: Prevacid is relatively safe for unborn and nursing babies, as it has been classified as FDA pregnancy category B. This means that pregnant and breastfeeding women that need this kind of treatment may be taking this drug - after talking to their health care provider. Although Prevacid is not expected to do any harm to an unborn baby, if taken by a pregnant woman, it can pass into breast milk. If you are pregnant or breastfeeding, and think you need this kind of treatment- make sure you first talk to your doctor to learn about potential risks to your baby. Prevacid is very well tolerated with just a few mild side effects displayed - such as stomach pain, constipation, nausea, diarrhea, and headache. These side effects go away very soon and can simply indicate your body needs some time to adjust to the dose prescribed. If they do not go away and change in intensity - make sure you report them to your health care provider and see if any changes need to be made to your treatment schedule. This drug is intended for short-term treatment (usually from 4 to 8 weeks) and you are not supposed to take it for longer than recommended by your doctor. Prevacid is supposed to be taken before meals. If you have been prescribed the orally disintegrating tablet of Prevacid, make sure you take each one of them using clean dry hands and place on your tongue as soon as you get them out of the foil. The tablet is supposed to dissolve on your tongue within a minute and you will need to swallow several times to make sure all the medicine gets into your stomach. You may also have a drink of water after taking the orally disintegrating tablet.