Sarah 6 Jan 2006 02:13 pm Janice, how do you know Janice, how do you know which antibiotics you are allergic to? Very few people are allergic to doxycycline, for instance. Flagyl is not suitable for CPn by itself, since it needs the pathogen to be forced into the right stage of its life cycle before it can be killed by flagyl, as you can see here: http://herkules.oulu.fi/isbn9514269853/html/x467.html You need to ascertain what you are allergic to. If it is just the penicillins, there will be no problem, apart from getting someone to write the prescription......Sarah Completed Stratton/Wheldon regime for aggressive secondary progressive MS in June 2007, after four years, three of which intermittent. Still improving bit by bit and no relapses since finishing treatment.