dental abscess
"Had infection in tooth root canal which had been treated several years previously. My face was swollen and the pain was waking me every night. I was taking ibuprofen and paracetamol concurrently every 4 hours to ease the pain but it didn't work. I couldn't eat on that side and to touch my gums and even that whole side of my face was excruciating. I am allergic to Penicillin and its derivatives. I succumbed to a visit to the weekend emergency dentist and they prescribed Metronidazole, 400mg 3 per day for 5 days. It started working after 2 1/2 days. My face swelling disappeared after 3 1/2 days. After 5 days the pain was gone and I was off the painkillers. Extremely effective drug and pretty quick acting. No side effects for me whatsoever."