Iverhart has the same ingredients as Heartgard Plus except Iverhart contains praziquantel and I don't think Heartgard does. The preservatives are probably different also.
Interceptor does protect against some intestinal worms.
The dosing is 5x more than it needs to be to do this.
The dose could be 5x smaller and still protect against heartworms.
I have never heard of Interceptor not working in particular...just that some of the heartworm meds may be losing effectiveness.
Revolution appears to have a higher reaction rate than other heartworm meds and the heartworm protection is questionable.
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