I had pneumonia in Dec. and became allergic to the antibiotics I was on (Zpak and Amoxicillin). I am also allergic to Levaquin. (Broke out in rash) Now I have a sinus infection and am coughing up mucous or phlegm. Now a doctor put me on sulfamethoxazole. Is it safe for me to take it?
Sulfamethoxazole is a sulfa  ChatDoctor.  If you are allergic to that class of