Displaying 19 results of Tenofovir Disoproxil Impurities Tenofovir Disoproxil is an antiretroviral drug used to treat HIV and hepatitis B. During the manufacturing process, impurities may be introduced that can affect the quality and safety of the drug. These impurities must be tested and controlled to ensure that the drug is effective and safe for patients to use. Some of the impurities that may be present in Tenofovir Disoproxil include related substances, residual solvents, and degradation products.