sinusitis
"I was prescribed a five day round with the Z-pak after developing a severe flu-like upper respiratory infection with stuffed and painful sinuses plus aches, sore throat, diarrhea, muscle pain, nausea, and more. I had a Rituxan infusion, and all of this started the next day (common side effects or adverse events). I have rheumatoid arthritis, and my immunosystem is screwed to begin with and the Rituxan infusions temporarily make it worse. So I picked up a bug; bam!



Long story, short ending. The Z-pak began working almost immediately, and two hours after my second pill of 250 mg (first was 500) I don't feel sick. My sinuses are still a bit clogged but that's livable. I'm impressed."