Is okay to take st. john's wort while also on a stimulant?

Not recommended: We dont know the long term effects of st johns wort especially when combined with stimulants.

I wouldn't: St. John's wort may have at least weak maoi activity, such that any increases in neurotransmitters resulting from the stimulant could theoretically be boosted higher than expected. Other effects of sjw may be to induce other enzymes. I would not recommend combining these. Relatedly, one study using sjw alone with adhd showed it to be less effective than placebo. http://tinyurl.com/k38hd5e.