Is it fine to meditate on ADHD medication?

I am a practicing Buddhist following the Thai forest tradition. I have ADHD and take extended-release methylphenidate (an ADHD stimulant every morning). I also meditate in the mornings. My question is whether it is proscribed in the Canon to meditate on ADHD medication. Clearly, these stimulants did not exist in the Buddha's time, but would the advice on something like methylphenidate be the same as the advice for caffeinated tea? I am able to progress further in my meditation when I take the medication before meditating, but is it hampering the progress in the mind to meditate on a mind affected by a stimulant? Please back up your answers with passages from the suttas if possible. Thank you.