Sulfamethoxazole / trimethoprim
"I've had sinusitis for 9 months. Tried to treat it with natural remedies but it finally affected my lungs causing severe chest infection. I've been taking trimethoprim 400mg twice a day for 3 days and I can say that I am feeling much better. No major side effects apart from nausea bit eating small amounts of food at regular intervals is helping. No upset stomach or stomach pains which surprised me due to having IBS. Anyone suffering side effects always remember that any antibiotic will cause you to feel unwell. You have to persevere with it and they will ease. Failure to compete the course of medication will result in the infection coming back."