Drug Interactions is a powerful international application to list and document interactions for all drugs. It also includes Prescription Checker, our application to detect more than 200 million potential drug interactions between two pharmaceutical forms. Drug interactions are detailed and drugs can be searched for from generic or brand names. Substitution by a similar drug or search for a drug are facilitated by browsing our comprehensive pharmacological classification. Patient management to store prescription history was added from version 1.2.7.