Depending on how strong your pre-workout is and how your body reacts to caffeine and other stimulants, some restless emotions may be inevitable. However, many pre-workouts today contain stimulants that are supposed to be "smoother" than pure caffeine like Theacrin, or have calming compounds that "decrease" the effects of caffeine such as L-theanine.
Note that the International Society for Sports Nutrition indicates that when dosing caffeine based on body weight the range for optimal effectiveness is between 3 and 6 milligrams per kilogram or between 1.3 and 2.7 milligrams per Pounds body weight is. [1
That is, you can also take some control over the situation by paying more attention to your other diet before exercise.
"When you drink coffee on an empty stomach, you know the feeling: reckless, nervous, and sometimes even evil," explains Krissy Kendall, Ph.D., in the article "3 Mistakes You Make With Your Pre-Workout." "If you drink a pre-workout with 200-300 milligrams of caffeine without eating anything, you can feel the same way."
The answer, says Kendall, is to take your pre-workout meal as seriously as you treat your pre-workout supplement. "Taking a small meal 30-60 minutes before training can minimize side effects like these," she says. "In addition, these extra nutrients help you get your workout done."