Can i donate blood while on antibiotics?

No: You have to be in good general health, and if you are on antibiotics, even if feeling better, should not be donating until a few days after you are off of the antibiotics. It is safer for you and the recipient--as may also cause an allergic reaction in the recipient if allergic to the antibiotic meant for you. Tune up your health a bit first, then call the red cross to set up a donation.