The generic version of Bactrim, which combines the medicines Sulfamethoxazole and Trimethoprim, is widely used to treat a variety of illnesses, including bacterial infections and some forms of Penumonia. Bactrim should not be given to children under the age of one, despite being one of the safest medications for such medical issues. This medicine should not be used to treat viral infections like the flu or the Covid-19 novel influenza virus since it is not designed to treat these types of illnesses. Bactrim is available as tablets that may be taken orally together with a sufficient amount of water.