Hello @elainemargaret, Welcome to Connect. Here is some information from Drugs.com on Septra (Generic name: sulfamethoxazole and trimethoprim): https://www.drugs.com/septra.html. @gaylea1 and others with experience taking Septra may have some information to share with you.

Was the Septra prescribed to treat an infection of some type? Did your rheumatologist give you a reason for prescribing Septra?