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Yes, the drug would still be in your system. By 3.5 hours, your stomach would have already sent the medicine downstream for it to be absorbed. The peak drug levels in the blood are achieved between one and two hours after the drug is swallowed.
So, since it has been 3.5 hours since the drug was taken, there is no need to repeat the dose. The dosing regimen would vary according to the location of the yeast infection. If you were taking a single dose, then you are done with treatment and this will still be effective. If you are taking the drug for multiple doses, then take the next dose on schedule.
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