Here's some interesting info I found:
Regurgitation of food may result from handling a snake too soon after it is fed. Regurgitated food is undigested and relatively odorless. Another common cause of regurgitation is inadequate and incomplete digestion caused by relatively cool environmental temperatures. In these cases, the regurgitated food appears digested and is malodorous. Other causes of regurgitation include stress in easily excitable species, parasitism, intestinal obstruction and serious internal disease. An experienced veterinarian should be consulted if the cause is not readily determined.
Once a snake regurgitates, it is likely that it will regurgitate again at the next feeding if special precautions are not taken. Regurgitation rids the snake of the natural gastric fluids, and it takes nearly 2 weeks for the fluids to return to normal. If fed a normal size meal soon after regurgitation, without the proper fluids, the snake cannot digest the food, and will regurgitate again. A hatchling that regurgitates three consecutive meals may die.
If the snake regurgitates, it should not be fed again for 7-10 days, and then the meal should be much smaller than normal. Hatchlings should be fed a small, newborn pinkie mouse or a pinkie head for the next feeding. After 2 successive regurges on any snake, regardless of the size, we recommend that the next feeding be a pinkie head. Gradually increase the size of the food size over the next 2-3 feedings. If the problem persists, it may be necessary to consult a veterinarian.
Regurgitation can be caused by too low temperatures, feeding during shedding, or bacterial infection. Snakes that frequently regurgitate can often be cured by giving one time dose of GSE (grapefruit seed extract) in the drinking water at a dose of 3 drops per cup of water. GSE can also be used routinely in the drinking water at a dose of 5 to 10 drops per gallon.
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