Augmentin Does Not Cause Hyperkalemia
Augmentin (amoxicillin-clavulanate) is not associated with hyperkalemia and does not appear on established lists of medications that cause this electrolyte disturbance. The FDA label for Augmentin does not list hyperkalemia as an adverse reaction, and the drug contains only a negligible amount of potassium (0.23 mEq per 5 mL) 1.
Evidence from Guidelines
The 2018 European Society of Cardiology expert consensus document on hyperkalemia management provides a comprehensive table of drugs that cause hyperkalemia 2. This authoritative guideline lists:
Drugs that decrease potassium excretion:
- Potassium-sparing diuretics (spironolactone, triamterene, amiloride)
- Beta-blockers
- NSAIDs
- RAAS inhibitors (ACE inhibitors, ARBs, MRAs)
- Trimethoprim-sulfamethoxazole
- Penicillin G (notably listed)
- Heparin
- Calcineurin inhibitors
Drugs that increase potassium intake:
- Potassium supplements
- Salt substitutes
- Stored blood products
Critically, Penicillin G is specifically mentioned, but amoxicillin and amoxicillin-clavulanate (Augmentin) are conspicuously absent from this comprehensive list 2.
Why the Confusion Exists
The confusion likely stems from the fact that Penicillin G (not Augmentin) can cause hyperkalemia because it is formulated as a potassium salt and administered in large intravenous doses 2. This is a completely different drug with a different formulation and route of administration.
Clinical Context
When evaluating hyperkalemia risk in patients, focus on the actual culprits 2, 3:
High-risk medications:
- ACE inhibitors/ARBs (most common cause in practice)
- Potassium-sparing diuretics (spironolactone, amiloride)
- NSAIDs
- Trimethoprim-sulfamethoxazole (recent 2023 data shows 3.36-fold increased risk) 4
High-risk patient factors:
- Renal impairment (especially eGFR <30 mL/min/1.73m²)
- Diabetes mellitus
- Age >60 years
- Concurrent use of multiple RAAS inhibitors
Common Pitfall to Avoid
Do not confuse Augmentin with Penicillin G. If a patient on Augmentin develops hyperkalemia, look for the actual causes: renal dysfunction, concurrent ACE inhibitors/ARBs, NSAIDs, potassium-sparing diuretics, or dietary potassium excess 2, 5. The hyperkalemia is not from the Augmentin.
Monitoring Recommendations
For patients at risk of hyperkalemia (those on ACE inhibitors, ARBs, or with CKD stage 3-5), the 2021 Mayo Clinic guidelines recommend checking potassium within 1 week of starting or escalating doses of high-risk medications 6. This monitoring is not necessary for Augmentin alone unless the patient has other risk factors.