I am lucky in that my doc writes the prescriptions for a 30 day supply. The way he writes one if them doesnt make much sense to me...take 1 to 2 tablets every 4 to 6 hours. 2 tablets every 4 hourswould mean 12 per day if my math is correct...but there is only enough for 4 per day. But 4 per day in conjuction with the other ones is enough to knock the pain down to a somewhat tolerable level. At least as far as my back goes. This stuff doesn't seem to be doing squat for my shoulder pain.