Didanosine (ddI) is a purine nucleoside analogue reverse transcriptase inhibitor that terminates HIV proviral DNA chain elongation, used as part of combination antiretroviral therapy. Simson Pharma's Didanosine reference standard and impurities support compendial testing for this established antiretroviral.

Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) supply high-quality Didanosine Reference Standards, pharmacopoeial reference materials, and its related impurities to pharmaceutical manufacturers, CROs, analytical laboratories, universities, and regulatory organizations worldwide. To service the Europe and America market efficiently, Simson Pharma Limited has set up Simson Pharma Global Ltd. in United Kingdom and Simson Pharma Global LLC in USA respectively.