Oolong tea contains caffeine. The body breaks down caffeine to get rid of it. Mexiletine (Mexitil) can decrease how quickly the body breaks down caffeine. Taking mexiletine (Mexitil) along with oolong tea might increase the caffeine effects and side effects of oolong tea.

Is Oolong high in caffeine?

Depending on the brand/variety chosen, Oolong tea can range from just 16.6 mg/cup to 55.4 mg/cup. ... In general, expect Oolong tea to have more caffeine than green tea but less caffeine than black tea.

Is oolong tea good for sleep?

Significantly, there was no noticeable difference in sleep patterns or the time it took participants to fall asleep between the treatment and placebo groups, indicating that drinking oolong tea is unlikely to prevent you from getting a good night's rest.