As it’s your body you can have as many as you like. However, if you take too many even the best energy pills will produce some or all of the above-listed side effects. You are also virtually guaranteed to crash hard when the effects wear off. Most doctors advise not taking more than one 200 mg energy pill per day. Especially if that energy pill is a straight-up caffeine pill. To get optimal results from that energy pill to take it some 20 minutes before you begin working out. If you are taking it to help with school or work performance make sure you don’t take it too late in the day as it may negatively affect your ability to get to sleep.\r