4 doctors weighed in:
If I have a bactrim (sulfamethoxazole and trimethoprim) allergy how fast when symtpoms appear after taking it?
4 doctors weighed in

Dr. Larry Lutwick
Internal Medicine - Infectious Disease
3 doctors agree
In brief: Sulfonamides
Depends on what the reaction is.
Ige mediated allergy such as hives and anaphylaxis can occur in minutes.

In brief: Sulfonamides
Depends on what the reaction is.
Ige mediated allergy such as hives and anaphylaxis can occur in minutes.
Dr. Larry Lutwick
Dr. Larry Lutwick
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