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Ask your doctor to write your prescription for more than you need that way you always have medicine available and won't run out. My first doctor did that for me and I've been very thankful. In my experience, the amount of medicine you need depends on how you are feeling. If you are sick or stressed out you may need more. Intense activity also makes me need more. As does weight gain. Find a doctor that will work with you and help you to find your range and to understand how you can safely dose yourself.