naproxen + histidine

**Naproxen + histidine** is a combination product that contains the nonsteroidal anti-inflammatory drug (NSAID) naproxen and the amino acid histidine as oral tablets or kits intended for human use[1]. Naproxen is a well-known NSAID used for its analgesic, anti-inflammatory, and antipyretic properties, primarily for the relief of signs and symptoms of rheumatoid arthritis, osteoarthritis, and musculoskeletal pain[2]. The addition of histidine, a nutrient and potential buffer, to naproxen may aim to modify the product’s physical properties, possibly affecting stability, absorption, or tolerability, although specific pharmacological synergy or clinical benefit from the histidine component has not been documented in the available medical literature[1]. **Mechanism of action:** Naproxen works by non-selectively inhibiting cyclooxygenase (COX) enzymes, COX-1 and COX-2, thereby reducing the synthesis of prostaglandins, mediators of pain, inflammation, and fever[2]. COX-2 inhibition is mainly responsible for the anti-inflammatory effects, while COX-1 inhibition is associated with gastrointestinal side effects such as ulceration and bleeding[2]. The role of histidine in this combination is unclear from available sources—histidine is a natural amino acid, but its inclusion in this medicinal product is likely not for a direct pharmacological effect but rather for formulation purposes. **Primary indications:** As per the label for naproxen as a single agent, it is indicated for relief of the signs and symptoms of rheumatoid arthritis, osteoarthritis, and musculoskeletal pain[1][2]. There is no evidence of additional indications specific to the naproxen + histidine combination beyond those of naproxen alone.

Brand names

Trepoxen-250Trepoxen250Trepoxen 250