Hello dear. Sometimes antibiotics may cause bloating of the abdomen and gastritis. Hence it is better to take it after food and avoid taking it on empty stomach. As such heart burn is not specific to clindamycin and may not be actually related to it. Common clindamycin side effects may include: 1. nausea, vomiting, stomach pain; 2. mild skin rash; or 3. vaginal itching or discharge in women. Some of the tips i would like to suggest you to combat gastritis are 1. Do not eat spicy food 2. Take medications without fail as prescribed by your doctor for gastritis 3. Take little food at frequent intervals. Breakfast around 8am, small snack at 11am, lunch at 1pm, small snack at 4pm and dinner at 8pm 4. Drink plenty of water 5. Do not take much of stress. Stress aggravates gastritis 6. Do regular exercise. Atleast half an hour per day 7. Learn meditation techniques 8. Follow this regularly for 21 days. It is said that anything you practice regularly for 21 days becomes a habit Hope i have answered your question. Feel free to contact me if you have any more questions. I ll be glad to help you. All the best With warm regards Dr Sanjay Kini