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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
It's usually 50mg 3 times a ay but if you are suffering with back ache that bad you should do what pigeto suggests and see your GP. If it's a spasm something like diazepam might be more appropriate, Hope you feel better soon.