One must be careful, however, of the amount of damiana ingested. Chemical data show that the essential oils of damiana contain at least twenty different compounds. Other parts of the leaves contain even more uncommon compounds. A report from the old scientific literature tells about a man who was poisoned by an overdose of damiana, thus consumers should be careful about dosage when using it.
需要注意的是大迷亞納的用量，前面提到化學分析可析出大迷亞納的二十餘種成分，但還有更多分析不出的物質，古老的科學報告曾紀錄有人飲用大迷亞納過量而中毒的案例，因此服用者要特別注意劑量問題。