Don't bother with the anti-vomiting medicine. Puking is a sign of overdose, no OTC drug is going to hold it back. The mess from Puking will be the least of your problems. Using Fentanyl by someone without an opioid dependance is both ignorant and reckless. I know you're at the point in your life where you want to rebel with self-destructive behavior, this is just plain irresponsable. Why not try heroin 1st. Once Fentanyl is in your system, there's no pumping your stomach to get it out. Unless someone in your circle has Narcaine, chances are you'll be dead before the paramedics arrive. Be sure to brush up on the signs of overdose; Vertigo, clammy skin, pinned pupils, feelings of impending doom. Overdosing is not pleasant, it's terrifying. Usually I'm a proponent of Harm Reduction. However, when it comes to Fentanyl, the only safe alternative is not to do it. Find a frequent opiate user and see if they will trade you for something weaker. Swallow your pride and use your brain. Not only are you playing with your own life, you're risking everyone that you share this drug with. Use of Fentanyl is a felony. That means if someone ODs and you have to call 911, the police will also show up and all of you will get charged. And your charge of you Distributing will definately get you some prison time. Good luck.