As a for instance, paracetamol is a pain killer when taken as prescribed. Taken at bigger quantiities than prescribed it becomes something else.

The point I was making is if prescribed at one tablet a day Doxy is not at a strength to be an effective antibiotic. So you describing its use as a prophylactic also as being an antibiotic is not really correct (you would have to double the dose or more for that), and it won't have as bad a long term effect than it or any other drug prescribed at a strength to act as an antibiotic. It is of course prescribed worldwide as a prophylactic, and both by my GP and travel clinic nurses in fact because they know I will be taking it for perhaps a year or more. Malerone would perhaps be better but at what cost for long term use, and then I can't change dose of the Doxy if I have something it could treat.

Many people develop resistance to certain antibiotics just from the amounts given by their GP, but there are always(?) alternatives available to them. You suggest the results of taking doxy long term is a thing to be avoided which as I said does go against all current general medical advice available to me. I think you are over stating your case in a dramatic way which does not help this thread. The only assumption I made was that you must be medically qualified. The rest of my previous post was as told to me by medical nurses and GPs, some of which are experts in travel medicine, but I can't type here that you can definitely change your Doxy dose from one to two a day to start acting as an effective antibiotic as I'm not qualified to do so!

Cheers

Jason