Gravel is just name of the brand. The medical name is Dimenhydrinate. I had the stomach flu as a kid for 3 weeks straight where I'd have dierera and puke at the same time non stop. I even missed my aunts funeral it was that bad. Legit I survived by taking that stuff and Gatorade. The stuff makes you sleepy so you will sleep all day and the Gatorade has salt in so it will help calm your stomach pains you may have (just make sure you sip and not chug it back).