bacterial infection
"I'm 19 and was prescribed 750 mg for 14 days, stopped after 3 days after noticing soreness in knees and in heel. I was terrified to take this, but being allergic to penicillin and azythromycin I had to try it. Its now been 3 days since my last dose and I still have notable soreness in right heel. I am praying this goes away. I can still walk, but I definitely can't exercise. I am taking magnesium supplements and Bromelain for inflammation, with Ibuprofen.  

Otherwise, I had no problems with sleep (if anything I was more tired) and no stomach upset. I think its also worth mentioning that I suffer from anxiety already and this did not worsen my pre-existing condition. Give it a shot, but the second you notice soreness anywhere,stop taking it."