Your limit should be exactly what your doctor prescribed. If you are finding yourself needing more, or the prescribed dose isn't working, then you need to see your doctor and talk to them about it so you can find some solution. If you continue to adjust the dosage yourself, you are going to find yourself addicted and running out earlier and earlier each month, because you are using more and more of them. There is a reason your doc only gives you a certain number of pills per scrip fill and a reason they have you take one every so many hours.
If you are continually wanting to take more, you have a problem and need to see your doctor about it.
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