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Originally Posted by diggy4  I can call later im at work now and they could hear what im talking about but typing that they have no idea 
id say i give sentinal 8 months of the year. Plus with all this overdosing we seem to be doing i wonder if its actually lasting just a month anyway. Hell for years they were telling us these vac's were only good for a year and now look its more like 3 years for some! I do the yearly heartworm test and hopefully we just say negative with it all!  |
Heartworm med only lasts for a couple days.
It isn't a prevention. It is a cure.
It kills certain larvae that are a certain number of days old before they move to the heart. I'm not sure about Interceptor (and I doubt they will say) but with Heartgard the grace period is 15 days. So technically you don't have to give Heartgard every 30 days. You can give it every 45 (42 to be safe).
Anyone who is considering this schedule, please check with your vet.
These companies say that it is an easy once-a-month pill and that's a good way to remember, but really it is a good way for the companies to make more $$$.