What are the side effects of Aminocaproic Acid?
Last updated September 7, 2026.
**Most side effects of aminocaproic acid are mild and short lived, such as nausea, stomach upset, headache, dizziness, and nasal stuffiness.** How you feel depends on the dose, how long you take it, and whether you get it by mouth or by vein. Fast intravenous dosing can drop your blood pressure and cause flushing, so it is given slowly. Higher doses taken over weeks can irritate muscle tissue, causing aching, weakness, and dark urine, and your care team may check a blood test called CK. Because the drug works by slowing the breakdown of clots, blood clots are a possible risk, which matters most if you have had a clot, are immobile, or have kidney problems. Taking oral doses with food and spreading them evenly through the day helps with the stomach effects.
What to do
- Take it with food: Swallowing oral doses with a snack or meal cuts nausea and cramping for most people.
- Keep the schedule even: Doses are usually spaced through the day, so set reminders rather than doubling up after a missed dose.
- Watch your muscles: Report new aching, tenderness, weakness, or cola colored urine right away, since these can signal muscle injury.
- Know the clot signs: Seek care for calf swelling and pain, sudden shortness of breath, chest pain, or one sided weakness.
- Share your full med list: Tell your clinician about hormonal birth control, estrogen, clotting factor products, and any history of clots or kidney disease.
- Stand up slowly: If you feel lightheaded, rise gradually and skip driving until the dizziness passes.
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