What is happening. Bempedoic acid can raise serum uric acid by competing with uric acid for renal tubular secretion via OAT2, and gout has been reported as an adverse effect. High-dose vitamin C (typically several grams per day) has a uricosuric effect that lowers serum uric acid. While this could theoretically offset bempedoic-acid-induced hyperuricemia, very high vitamin C intake also increases urinary oxalate and uric acid excretion, which can promote kidney stones in susceptible individuals. The interaction is minor and not a reason to avoid either agent.
Mechanism. Bempedoic acid inhibits renal OAT2-mediated tubular secretion of uric acid, reducing urate clearance and raising serum levels. High-dose vitamin C has an opposing uricosuric action but increases urinary urate and oxalate load. The two interact only at the level of renal urate handling, not through hepatic metabolism.
Recommendation. Normal dietary or low-dose supplemental vitamin C is fine with bempedoic acid. If you take gram-level vitamin C and have gout, hyperuricemia, or a history of kidney stones, discuss this with your clinician, since both bempedoic acid (raising uric acid) and high-dose vitamin C (increasing urinary uric acid/oxalate) act on renal urate handling. Periodic uric acid monitoring is reasonable while on bempedoic acid.