Lansoprazole (Prevacid) Overview, Dosage, How to Take, Side Effects and Warnings

Lansoprazole (Prevacid) dosage. Prevacid SoluTab dissolves under the tongue. First-Lansoprazole is a powder that is made into an oral suspension. Prevacid 24hour should be taken only once every 24 hours for 14 days. It may take up to four days for the full effect. Do not take more than one tablet every 24 hours. If you are taking the over-the-counter medication, stop taking after 14 days and call your doctor if there has been no change in your condition.