Clindamycin
"For my sinus infection they originally gave me penicillin which landed me in the ER. Apparently the ER doctor said penicillin wasn't strong enough to combat it. So she prescribed me this clindamycin but told me that I will feel relief in 48 hours. Now being bedridden for 5 days on penicillin I was excited and 2 days later I can finally breath through my nose. Didn't have to worry about dry mouths since I had to breath through my mouth even when I TRIED sleeping."