What side effects can olmesartan medoxomil 20 mg cause?
Olmesartan medoxomil (a drug in the angiotensin II receptor blocker, or ARB class) can cause side effects at the 20 mg dose, including effects that are common, less common, and rare-but-serious.
Commonly reported side effects include dizziness and tiredness (fatigue) [1]. Some people also report stomach-related symptoms such as nausea or diarrhea [1].
What are the serious side effects to watch for?
Serious reactions are less common, but patients are advised to seek medical care promptly for warning signs such as:
- Swelling of the face, lips, tongue, or throat, or trouble breathing (possible allergic reaction) [1]
- Signs of high potassium, which can include muscle weakness or abnormal heart rhythm (more likely in people with kidney problems or when combined with certain other drugs) [1]
- Signs of kidney problems, such as reduced urination or unusual swelling, particularly in people with existing kidney disease or dehydration [1]
Because serious events depend on a person’s overall health and other medications, the exact risk varies.
Can olmesartan cause low blood pressure or kidney issues?
Yes. Like other ARBs, olmesartan can lower blood pressure too much, which may cause dizziness, lightheadedness, or fainting, especially after starting therapy or increasing dose [1]. It can also affect kidney function, especially in people who are dehydrated, have renal artery stenosis, or are taking medications that impact kidney blood flow or electrolytes [1].
Clinicians often monitor kidney function and potassium after starting or changing ARB therapy, particularly in higher-risk patients [1].
What side effects are more likely in certain groups?
Risk of adverse effects is higher for people such as:
- Those with kidney disease (greater chance of worsening kidney function or high potassium) [1]
- Older adults or people who are prone to dehydration (more likely to experience low blood pressure symptoms) [1]
- People taking certain interacting medications (for example, potassium-raising drugs or medicines that affect kidney function), which can raise the risk of hyperkalemia or kidney-related side effects [1]
How soon do side effects show up, and what should I do if I feel them?
Many dose-related effects like dizziness or lightheadedness show up early, often soon after starting or after a dose change [1]. If symptoms are mild, patients may be able to monitor while they contact their prescriber for advice. If symptoms are severe (fainting, breathing trouble, facial swelling, or signs of significant illness), urgent medical care is appropriate.
If you tell me your age, kidney history, and other medications (especially diuretics, potassium supplements, or NSAIDs), I can help you identify which side effects are most relevant to you.
Sources
- https://www.drugs.com/sfx/olmesartan-medoxomil-side-effects.html