My dog takes NexGard and Heartgard. Can they cause seizures or side effects?

Yes. Like all medications, there can be side effects, including vomiting and diarrhea. Here is the product insert that discusses everything about the medication. Look at the section called "Adverse Effects": https://nexgardfordogs.com/assets/NexGard_PI.pdf

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! I prescribe Nexgard and Sentinel together multiple times per day. I haven’t heard of any reactions. Just like people some dogs can react to certain medications. If you google any medication for human or animals you will find stories of adverse reactions. No drug doesn’t come without side effects. To be safe give the drugs 2 days apart the first time you give them. I have some clients that give one the 1st of the month and the other mid month. Personally I haven’t heard of any reactions going the 2 together. I hope this helps and I wish you all the best!

Hello. All tick and flea products if overdosed or if the individual animal has a sensitivity can cause seizures as the drugs typically work on the nervouse system of the insects. Check with your vet about which products in your area are safe and effective. Avoid cheap products because amounts of drug aren't regulated and we often see advrse side effects with the grocery store products (or dollar store products). Also, always give as directed and don't overdose or give a different animal meds meant for your animal or vice versa. Overall zoetis products like nexguard and bravecto are good and this looks like their new product.

Hi, thank you for using Petco Pet Education Center, formerly Petcoach. Poor Myla, it sounds like she is having a bad time. The hairloss can occur from both ringworm and Demodex. Lethargy and loss of appetite could be a possible side effect of nexgard or can also be side effects of any antibiotic and antifungal medications she may be on. As long as she is relatively alert and active, then I would contact her regular vet in the morning to discuss your concerns. If she is severely lethargic, hasn't eaten at all in more than 12 hours or showing other signs of illness then I recommend taking her to an emergency vet tonight to have her checked out. I hope she's feeling better soon.

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Blitz! It is possible that it is from the Nexgard. There isn’t a specific medication to counteract the effects, just supportive care. I would contact your vet so they can report the reaction to the company. Sadly, as with any medication, there is potential for negative side effects with Bexgard. It is generally very well tolerated and it is very effective. Vomiting and diarrhea are reported side effects in the drug insert provided by the company. I have never heard of frequent ruination. It sounds like Blitz should have a recheck to make sure he is stable and to provide supportive medications for his symptoms. I wish you both the best!

Poor pup! Nausea is less common with Nexgard than with some of the other oral flea meds available (such as Comfortis or Trifexis), but can still happen in some dogs. Normally, giving the pill with a meal helps to prevent this, but it doesn't sound like it's helped much for your dog. It normally doesn't matter what type of food you give it with, because the purpose of giving with a meal is to slow absorption of the medication so that it's more gradual - it's the presence of food in the stomach that helps, rather than any specific ingredients. So if this hasn't helped with your pup, you may want to try a different medication next month - the vomiting isn't dangerous and is not a sign of toxicity problems or any other serious issues, but I know it's no fun for either of you to have him vomit every month! He might do better with Bravecto, or a topical flea/tick med such as K9 Advantix.

He should be OK. Don't give him the next dose of the medications until March 1st and even then, it is best to give one drug one day, wait a few days and then give the other. Giving them at the same time may be too hard on his system.