Side effects and cautions

Few people have side effects when taking angiotensin II receptor blockers. Possible side effects include:

• Dizziness
• Elevated blood potassium level (hyperkalemia)
• Localized swelling of tissues (angioedema)

There have been some reports of intestinal problems in those taking olmesartan. Talk to your doctor if you develop severe diarrhea or lose a lot of weight while taking olmesartan.

Because angiotensin II receptor blockers can injure a developing fetus, don't take them if you are pregnant or plan to become pregnant.