Normally, cats won't vomit up hairballs after taking hairball remedy. This is because hairball remedy lubricates the gastrointestinal tract, helping the cat expel hairballs with its feces, thus preventing vomiting. 
The function of hairball remedy:
1. To prevent hairballs, regularly feeding your cat hairball remedy can help prevent the formation of hairballs.
2. Softens hairballs: Hairball remedy can soften hairballs, lubricate the intestines, aid digestion, and help hairballs be quickly expelled or vomited out.
3. Promotes digestion: Hairball remedy can enhance gastrointestinal motility and promote digestion. Therefore, it helps cats defecate and smoothly expel hairballs after eating it.
