Drugs Home > Omeprazole

A healthcare provider may prescribe omeprazole to treat gastroesophageal reflux disease (GERD), H. pylori infections, certain ulcers, and other conditions. The drug works by decreasing the amount of acid in your stomach. Omeprazole comes in the form of a capsule or a packet that is mixed to make an oral solution. Common side effects include headaches and the common cold.

What Is Omeprazole?

Omeprazole (Prilosec®) is a prescription medication used to treat several conditions related to the esophagus, stomach, and intestines. It is part of a class of drugs known as proton pump inhibitors (PPIs).
Nonprescription omeprazole magnesium (Prilosec OTC®) is also available for treating heartburn.

Side Effects of Omeprazole

As with any medicine, side effects are possible. However, not everyone who takes the drug will experience side effects. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider. Serious side effects are less common.
Common side effects include, but are not limited to:
  • Headaches
  • Abdominal pain (or stomach pain)
  • Upper respiratory infections, such as the common cold.
(Click Omeprazole Side Effects to learn about specific side effects of this drug, including some of the more serious side effects that you should report to your healthcare provider. You can also read about possible side effects by going to:
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
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