I've taken three dosages of bactrum ds can i still end up having serum sickness? my left hand hurts right on the top. for no apparent reason. that's why i was wondering

Not necessarily: The symptom you have is irrelevant, serum sickness is still a rare disease, the most common drug causing it, is penicillin still, it can take days up to 3 weeks to develop, earlier if you had it before with the same drug. If in doubt, call your doctor, stop the drug if any suspicion of a likely symptom of a reaction/ allergy, good luck

NO: Serum sickness develops with sulfa drugs after a period (usually long term) of treatment! FURTHERMORE serum sickness joint pain is SYMMETRICAL ....not just with L hand/wrist! Hope this helps! Dr Z