Prevacid for 24-hour heartburn relief, Prevacid contains the active ingredient lansoprazole, which is an acid reducer, which helps prevent heartburn pain for a long time and works to reduce heartburn and treat recurrent heartburn. The medicine is not intended for immediate relief, but some people feel complete relief from symptoms within 24 hours. An effective treatment for heartburn and heartburn relief day and night. It is a proton pump inhibitor:
Prevacid turns off the pumps that produce the acid that causes heartburn.