Hi. Thanks for your query. Noted the history and understood the concerns. I can understand that Tetracycline is good for acne but it acts on to avoid infection in acne and does not have any positive effect for no development of acne. Acne come basically due to the skin inability to adapt to the hormonal changes one gets and hence needs the care of the skin, the stress and anxiety, psychological set-up, good sleep, proper hydration, avoidance of exposure to the hot and humid atmosphere. If only the acne get infected that you need an antibiotic ans request your Doctor to use another antibiotic that does not cause stomach upset as Tetracycline is causing it. For stomach upset caused by an antibiotic like this you need the following: Stop the antibiotics and other medications. Get a course of probiotics. take yogurt, curds, as natural probiotic and symptomatic treatment as indicated.