Parasite management in pregnant and nursing cats directly impacts the health of both the fetuses and kittens. Here’s a summary of the key information every pet owner should understand.



| Item | Usable Medications | Precautions |
|---|---|---|
| Early pregnancy | Permitted only under veterinary judgment | During early pregnancy, most medication use should be avoided, and expert consultation is essential |
| Mid to late pregnancy | Only certain dewormers with confirmed safety can be used under veterinary judgment | Decide only after consulting your veterinarian, considering the effect on the fetus |
| Lactation period (after birth) | Only certain medications with low risk of transfer into breast milk can be used under veterinary judgment | Choose only medications safe for the kittens, and consult your veterinarian about whether to suspend nursing after administration |
All medications must be used after a veterinary prescription, and the timing and dosage vary depending on the cat's body weight and stage of pregnancy.

Emergency Situations: When a Cat Exhibits Severe Diarrhea or Vomiting Due to Parasites
If a pregnant or nursing cat exhibits severe diarrhea, vomiting, bloody stools, or signs of shock, immediate veterinary attention is necessary. These symptoms may indicate a serious parasitic infection or adverse drug reactions, so prompt diagnosis and treatment can be life-saving.



A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.
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[1] The Cat, Clinical Medicine and Management, 2nd Edition, 2023
[2] Feline Emergency and Critical Care Medicine, 2nd Ed, 2022
[3] A Professional’s Guide to Feline Behaviour, 2021