On cephalexin 500mg 3/day sulfameth/trimethoprim 800/160 2/day. can i take these and my adderall (dextroamphetamine and racemic amphetamine) xr 20 mg? any interactions between them?

Drug-Drug interacts: There are no reported interactions between these antibiotics and adderall (dextroamphetamine and racemic amphetamine).

Drug interactions: You can use a drug interaction checker whenever you have questions about drug-drug interactions or drug - food interactions. Here is one option (Drugs.Com): https://www.drugs.com/drug_interactions.php Your pharmacist is also an excellent source of information.