bladder infection
"Commonly known as Keflex. I had burning  when urinating, urgency, retention, bloating and went to the ER. The ER MD diagnosed me with bladder cystitis (progression from a run-of-the-mill UTI from -regretfully- ignoring the symptoms). I was prescribed 500MG Keflex 4 times a day, 2000MG/2G daily. Never took Keflex before, but I know it's been around a while, and works wonderfully. This is actually my first day (second dose in). I already feel a difference. It's true - this drug does make you sleepy (for some odd reason). I have  not felt nauseous yet. Must take this with food, as always with any antibiotic - plenty of water too. Smells like rotten eggs, so toss it back and swallow."