Catnip is generally considered safe for cats to ingest in small amounts. However, like with any plant material, there is a risk of digestive upset if a cat eats too much. Here are some things to keep in mind about catnip ingestion in cats:

1. Digestive Upset: If a cat ingests too much catnip, they may experience mild digestive upset such as vomiting or diarrhea. This is more likely to occur if a cat eats a large amount of fresh catnip or if they ingest dried catnip.
2. Allergic Reactions: Some cats may have an allergic reaction to catnip, which can cause symptoms such as skin irritation, swelling, or difficulty breathing. If a cat experiences any of these symptoms after exposure to catnip, it is important to contact a veterinarian right away.
3. Sedative Effects: While catnip is generally known for its stimulating effects on cats, some cats may actually become sedated or lethargic after ingesting it. This effect is not common, but it is something to be aware of.
4. Increased Appetite: As mentioned earlier, some cats may experience an increase in appetite after exposure to catnip. While this is usually not a problem, it is important to monitor a cat’s food intake to prevent overeating or weight gain.
5. Drug Interactions: In rare cases, catnip may interact with medications that a cat is taking. If a cat is on any medications, it is important to consult with a veterinarian before giving them catnip.

Overall, catnip is considered safe for most cats to ingest in small amounts. However, as with any substance, it is important to monitor a cat’s reaction to catnip and to seek veterinary care if any concerning symptoms arise. Additionally, it is important to provide catnip in moderation and to keep it out of reach of cats who may eat too much or who have a history of digestive issues.