In response to a posted question, I, as a layman whose dog has Cushing's, believe the best way to treat a Cushing's dog is to start with the least toxic and advance if it doesn't work. In our case, we started with Anipryl (which we knew was a long shot) and when it failed to work switched to Vetoryl, which has worked quickly and spectacularly. Contrary to common belief, you do not need an FDA waiver to buy Vetoryl from its UK distributor but you DO need a prescription from your veterinarian. Our dog, a 10-year-old, 28-pound Boston, takes 90 mg. a day with 60 given in the morning and 30 given 9 hours later. She is now free of all clinical signs of Cushing's and her energy level, coat, appetite and urination frequency have returned to normal. Even her pot belly has begun shrinking back to normal. She has been taking Vetoryl four months. The improvement in symptoms began almost immediately with an abrupt end to her constant panting. However, we did later have to increase her dosage (by 30 mg., to its present level) to get the cortisol down to the desired level.
Our Vetoryl costs just over $95 a month, including shipping. We buy it online from Masters International in the UK. Our last order arrived at our home in NC six days after we placed it. Our earlier orders took exactly a week.
I prefer Vetoryl to Lysodren purely because it is less toxic, has fewer side effects and its effects are fully reversible simply by discontinuing the drug. With Lysodren, a DDT derivative, some adrenal tissue is killed and though it is possible regrow tissue after discontinuing the drug, it takes time in most cases. Therefore, if you start with Lysodren and want to switch to Vetoryl it would be a bit trickier than the reverse approach would be. If and when Vetoryl ever ceases to work for our dog, we are fully prepared to try Lysodren. However, we don't expect that to be necessary.
Another advantage of Vetoryl/Trilostane is that there is no tricky loading period. You just start the medication and test your animal to see how it is working and tweak the dosge accordingly. You may have to test frequently at first, and those tests are a bit pricey, but one the cortisol levels are normalized the testing is needed only every 4 months or so. The key is to find a US vet who either has experience with the drug or is willing to expend the time and effort to use it properly and in partnership with the owner.
A couple of points about Vetoryl. First, the twice-a-day dosing, though contrary to the manufacturer's recommended once-daily approach, appears to be gaining favor among US vets who have used Vetoryl. In our case, we found that we also had to tweak the spacing between the morning dosing and the evening dosing. We deduced that the morning dosage was wearing off before the evening dosage kicked in and as a result our dog was getting slightly stressed for a couple of hours at bedtime. We reduced the spacing to 9 hours from 12 hours and that problem disappeared. Establishing the correct dosage and the correct dosing schedule is key to success with Vetoryl.
Incidentally, when last we had our dog's cortisol levels checked by our vet, which was a month ago, they were down to 1.5. That's one POINT five, not fifteen!! Before treatment began, the level was measured at twenty-eight (28). Needless to say, we are very pleased.
Finally, I personally would not recommend buying Trilostane (the chemical name for Vetoryl) from a compounding pharmacy. Although I am sure there are many very good compounding pharmacies who do fine work, the truth is that since Trilostane has not yet received final FDA approval for use in this country, those pharmacies are operating in murky area of law when they sell the drug here. Furthermore, it is my understanding that since compounders work from raw chemicals, the quality can vary or be inconsistent, especially with regulatory oversight lacking. To me, buying the drug in its legally manufactured form is a wiser course even if it may cost a bit more. Hopefully, final FDA approval will come this year and the purchasing process will be much easier. In the meantime, Masters International is very efficient, has great customer service and is entirely satisfactory. You can check out the company's website if you like simply by Googling it. We place our orders online, by the way.
The good news about Cushing's is that it is very treatable and once treated the animal can lead a long, high-quality life.