Is it OK to drink caffeine and alcohol while taking phentermine?

Taking phentermine together with alcohol or other stimulants can lead to cardiovascular stress, which may cause adverse health effects. Both phentermine and caffeine are stimulants. They both can cause insomnia, increased heart rate and jitteriness. It is likely that if you use caffeine while taking phentermine these side effects maybe slightly more. It is recommended that you limit you caffeine use while taking phentermine It is recommended that you avoid taking stimulants while taking phentermine. Caffeine is a stimulant, so limit your intake of caffeinated drinks while taking phentermine. Do not drink more than one caffeinated beverage per day if you are on phentermine. While taking phentermine, you should also avoid over-the-counter cough medicine containing caffeine as well as any products containing ma huang due to their potential interaction with phentermine.