I just gave my 8.5 month old Borzoi his second dose of Trifexis. Within 20 minutes of giving him the pill he threw it up along with a small amount of food. He did this when he took the first dose a month ago too. I let him eat his throw up the first time immediately after he threw up, as I did not want to re-dose him, not knowing how much could have been absorbed verses how much may not have been absorbed. One would logically assume since this is a combination drug, the chances for adverse reactions could increase as the dose increases(especially in an animal that vomitted it up two times). Given this drug apparently stays active for up to a month, I would not want to increase the dosage of something that could have potentially adverse reactions, as I would have no way of clearing the meds from his system in a time efficient manner should he show other adverse reactions.
Today, as I said upon giving the second dose he did throw up, but he would not eat all of what he threw up. So, I have no clue how much drug got absorbed, but I will not re-dose him, and will wait to see if he stays clear of fleas. He has not had a flea problem since he took the first dose, so it has been extremely effective against fleas.
The concerns I have with Trifexis are this: After he took the drug, his skin would have a distinct smell, and he blew most of his coat, and his hair looks dull. His coat prior to taking this medicine was coming in healthy, shiny and full. He is kept inside with the AC and only goes outside for brief bouts of exercise and to relieve himself. Yes, it is summer and maybe even though the dog is kept indoors, may go through a seasonal shedding, it just seems the shedding of the coat along with the dullness are directly related to his intake of the Trifexis. The other concern is, if the dog keeps throwing up his dosage, the cost would definitely be prohibitive. The first time like I said he immediately ate his throw up, (I know this sounds gross, but given the cost of the meds, I felt it was okay), but today he did not eat it all immediately and thus after about 2 hours I felt I had no choice but to remove it from him in case he would choose to eat it later. He ate most of it, and hopefully he got most of the medicine.
Consider the following:
1)For me to spend $104.00 on a 6 month supply and have him throw it up two times on two different occasions is problematic concerning his health, and the safety of the meds!
2)For me to EVEN have to consider allowing my dog to eat his throw up to get the medicine in him for absorption is utterly ridiculous, even though cost effective!!!
3)Had I not allowed him to eat his vomit, that would have meant I would have spent $104.00 divided by 6, multiplied by 4, as I would have had to re-dose him twice to treat my dog for two months totalling $69.33 which is not cost effective!!!
4) I have lingering concerns about how this medicine is effecting his skin and coat, and given he is a pure bred dog whom I would like to have a nice coat, I wonder if mefeeding him a great diet for his overall health, including his coat, is being negated by this medicine. (My thoughts are I will see if his coat looks better in the winter, but I am somewhat disappointed as I feel the meds have destroyed his healthy coat he once ALREADY had grown in)
Well there you have my experience, and concerns. I found this site today as I was doing a search on negative effects of Trifexis, as I was concerned if anyone else had problems with their dogs coats while on this drug.