I was wondering about the different types of monthly heartworm preventatives that are out there. Beni's vet perscribes Sentinel, but you need a perscription to refill it, and I was wanting to get some online because it was cheaper. The vet is very hesitant about online purchasing of dog meds, but are they really any different? I ordered revolution for my cat and it seemed OK.

Any recommendations? What do you all use?

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Comment by Sarah C. on January 27, 2010 at 2:04pm
That's really cool that they do price matching!
Comment by Beni on January 27, 2010 at 1:49pm
I just went to the vet to ask them about getting a refill, and found out that they do price-matching with certain online pet pharmacies, so I looked up the two they mentioned and got $40 off a 12-month supply! To me that says that they really care about getting quality medication to pets and not just about profit margins. I didn't even have to pay tax!
Comment by Joanna Kimball on January 6, 2010 at 4:28am
The different types are:

- Heartgard (ivermectin)
- Interceptor/Sentinel (milbemycin)
- Revolution (selamectin)
- ProHeart/Advantage Multi (Moxidectin)

You can also use cattle ivermectin to replicate Heartgard; a lot of us breeders do.

I don't like to use Revolution because it's a MUCH higher dose of ivermectin (selamectin is a derivative) than in Heartgard. Something like 10x higher. I'd rather have people target the meds they use (if you have fleas, use Advantage or Frontline; if you have roundworms use pyrantel; if you have hookworms or whipworms use fenbendazole; if you have mange THEN use Revolution; don't just give Revolution in an attempt to kill everything even if it doesn't exist).

The effectiveness of the two basic meds (Heartgard and Interceptor - Sentinel is Interceptor plus Program for flea egg control) is very, very good. So if you want to switch to an ivermectin product like Heartgard or Tri-Heart to make it easier to order, that's a perfectly viable and safe way to go about things. If you want to use cattle Ivomec to make your own, be sure to look up the dosage and do the math to get as close as possible to the Heartgard dose. I can tell you what I do (0.1 cc per 100 lb of dog, so a corgi would get about .03cc) but please DO NOT construe this as medical advice. Maddie's Fund and Sheltermedicine.com are good places to look for off-label dosing.
Comment by Sarah C. on January 5, 2010 at 2:02pm
Your vet shouldn't be hesitant and if he is, it's because he would rather get kickbacks than have you buy it somewhere else. If a vet isn't willing to write out your prescription, you might consider getting a new vet.
Comment by Beth on January 5, 2010 at 1:25pm
We use interceptor.

Here's a good article on what to look for in online pet pharmacies; some have sold counterfeit or expired medication and that is probably why your vet is hesitant. There are good ones out there, though.

Comment by Beauty and the Beast on January 5, 2010 at 12:24pm
Your vet is weird, maybe he/she prefers you tu buy meds from them because of the profit they get. I've never heard of any problems with online meds. I order mine from total pet supply but to do that I have to either ask my vet to fax me the prescription or have the mearchant sent them request and then the vet sends it back to them. The first is easier, the second one took about 4 days because of delays and lazyness on both ends.
Just ask your vet for the prescription either in person or by fax.
By the way I've been using Interceptor since Shiro was a puppy and it seems to work.

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