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Hello, I'm Dr. Kara. I have over 20 years of experience as a veterinarian and I'd like to help. Please give me a moment to review your concerns.
I understand that you would like to give NexGard Spectra to help with flea control for Toby, but want to make sure it will not interact with cimetidine (which he is taking to control stomach upset associated with his cancer therapy) or cause him any trouble.
The ingredients of NexGard Spectra are afoxolaner and milbemycin, and neither one of those has any reported negative interactions with cimetidine. I do not see any problem with Toby taking cimetidine and NexGard Spectra concurrently.
Best of luck with your fellow.
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You are correct that there are very few guidelines associated with many holistic/alternative type supplements and prescription medications. I do not see any problem giving the NexGard now, as 6 hours later the turmeric is out of his stomach and well digested and absorbed.
As an aside I would be slightly wary of giving turmeric and omega 3 fatty acids together as both can act as anticoagulants and increase bleeding time.
My best to your pup!
Thank you for the picture! He looks like a puppy, definitely not like a senior citizen!