What are my rights regading a DUI if I'm currently taking long term pain time release medication as directed?

Question Details: I have been taking it for a cervical spine injury sustained over 10 years ago. After a minor automobile accident a little over a year ago, I was taken to hospital where after a blood test they found that I had 50 nannograms of medication in my system and thereby charged me with a DUI. The directions on the prescription clearly state to "Use care when operating a car or dangerous machinery". It does not state do not drive while using this medication. The current law in my state provides that any measurable amount of prescription medication will result in a DUI. Given the laws is this just cause for a case against the pharmaceutical company for failure to inform the consumer?

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