My first enema in a session is usually quite strong:
4 TBSP Epsom Salts,
6 oz. Liquid Vegetable Glycerin, and
Enough warm water to make an enema of one quart.
Usually I take this enema rapidly, and often will lose about one half of the enema the moment I pull the nozzle out. The balance of the enema will take about 45 minutes to completely expel. The cramps are usually brutal, and I often feel as though I'm going to vomit. I also feel dizzy sometimes. I have never vomited from this enema, and have never lost consciousness. If one enjoys cramps, this enema and Milk and Molasses enemas are both great in producing them.