L-Carnitine is an injectable form of levocarnitine, an amino acid derivative essential for transporting fatty acids into the mitochondria for energy production. It may be prescribed for carnitine deficiency, metabolic support, weight management, or as part of a supervised longevity or performance protocol.

Common side effects include nausea, vomiting, diarrhea, and a characteristic body odor caused by bacterial conversion of carnitine in the gut. Less common but serious effects include tachycardia, hypertension, TMAO, and fever. Discontinue and contact your provider if any serious symptoms occur.

Patients with a history of seizure disorders or significant renal impairment should consult their provider before use. Those with known hypersensitivity to levocarnitine or any component of the formulation should not use this medication.

Pivalate-conjugated antibiotics such as pivampicillin can increase carnitine excretion and cause depletion with prolonged use. Anticonvulsants including valproic acid, phenobarbital, phenytoin, and carbamazepine are associated with reduced carnitine levels. Inform your provider of all current medications before starting.

Caution is required in patients with renal impairment, seizure disorders, or those on valproic acid, which can cause elevated ammonia and hepatotoxicity when combined with carnitine changes. Your provider requires a complete medical history before prescribing.