While catnip is generally considered safe for most people, there are some potential side effects and risks associated with using catnip medicinally. Here are some things to keep in mind if you’re considering using catnip for its medicinal benefits:

1. Allergic reactions: Like any herb, some people may have an allergic reaction to catnip. Symptoms of an allergic reaction can include skin rash, hives, swelling, difficulty breathing, and anaphylaxis. If you experience any of these symptoms after using catnip, stop using it immediately and seek medical attention.
2. Drowsiness: Catnip is often used as a natural sedative and relaxant, and it can cause drowsiness in some people. If you’re planning to use catnip during the day, be aware that it may make you feel sleepy and impair your ability to drive or operate heavy machinery.
3. Interaction with medications: Catnip can interact with certain medications, including sedatives, antihistamines, and blood thinners. If you’re taking any medications, it’s important to talk to your healthcare provider before using catnip.
4. Pregnancy and breastfeeding: There is limited research on the safety of using catnip during pregnancy and breastfeeding, so it’s best to avoid using it during these times.
5. Overuse: Like any herb, using too much catnip can be harmful. Overuse of catnip can cause nausea, vomiting, diarrhea, and headaches. It’s important to follow the recommended dosages and to avoid using catnip for extended periods of time.

In summary, while catnip is generally considered safe for most people, there are some potential side effects and risks associated with using it medicinally. As with any natural remedy, it’s important to talk to your healthcare provider before using catnip, especially if you have any underlying health conditions or are taking medications. It’s also important to use catnip in moderation and to stop using it if you experience any adverse effects.