If your dog has been taking Trifexis and you're having trouble getting another supply, there are other monthly parasite preventives worth comparing.
Trifexis is a prescription veterinary medicine in the United States. It combines spinosad and milbemycin oxime to protect dogs against fleas, heartworm disease and several intestinal worms, but it does not provide tick protection.
Two alternatives with overlapping — and in some areas broader — parasite coverage are Simparica Trio and Credelio Plus.
They are not generic versions of Trifexis and should not be treated as identical medications. They contain different active ingredients and have different parasite coverage.
Smartway Pet Supplies supplies genuine Australian-market parasite prevention products from Australia to international customers. Products available through Smartway are supplied according to their Australian regulatory status and are subject to the import requirements of the destination country.
👉 Shop Simparica Trio at Smartway Pet Supplies
👉 Shop Credelio Plus at Smartway Pet Supplies
Why Does Trifexis Require a Prescription in the US?
Trifexis is a prescription-only veterinary medicine in the United States.
That means US retailers dispensing US-market Trifexis generally require a valid veterinary prescription before supplying it.
This can become frustrating when your dog has been taking the same parasite preventive for some time but you can't obtain another prescription without arranging a veterinary appointment.
The important distinction is that veterinary medicines are regulated differently from country to country.
Smartway is an Australian retailer. We supply genuine Australian-market parasite prevention products in accordance with their Australian supply requirements rather than dispensing US-market prescription medications.
If you're considering changing your dog's parasite prevention treatment, particularly if your dog has an existing medical condition or has previously experienced a reaction to parasite medication, speak with your veterinarian before making the change.
Trifexis vs Simparica Trio
Simparica Trio is one of the most useful products to compare with Trifexis because both provide monthly protection against several major parasites.
However, their parasite coverage isn't identical.
| Feature | Trifexis | Simparica Trio |
|---|---|---|
| Active ingredients | Spinosad + milbemycin oxime | Sarolaner + moxidectin + pyrantel |
| Fleas | Yes | Yes |
| Ticks | No | Yes |
| Heartworm | Prevention | Prevention |
| Roundworms | Yes | Yes |
| Hookworms | Yes | Yes |
| Whipworms | Yes | No |
| Dosing | Monthly | Monthly |
| Same formulation? | — | No |
What's the main difference?
The biggest advantage of Simparica Trio is tick protection.
Trifexis does not have a tick-control indication, whereas Simparica Trio provides protection against specified tick species in addition to fleas, heartworm and certain intestinal worms.
The trade-off is whipworm coverage.
Trifexis provides treatment/control of whipworms, while Simparica Trio does not provide the same whipworm coverage.
So Simparica Trio should not simply be described as a stronger version of Trifexis. It provides broader coverage in some areas and different coverage in others.
If tick protection is important where you live, Simparica Trio may be worth considering.
If your dog has a known history of whipworm infection, however, that difference should be taken into account before changing treatments.
👉 Shop Simparica Trio for Dogs
Trifexis vs Credelio Plus
Credelio Plus is another close alternative to consider because it combines flea and tick treatment with heartworm prevention and intestinal worm coverage.
| Feature | Trifexis | Credelio Plus |
| Active ingredients | Spinosad + milbemycin oxime | Lotilaner + milbemycin oxime |
| Fleas | Yes | Yes |
| Ticks | No | Yes |
| Heartworm | Prevention | Prevention |
| Roundworms | Yes | Yes |
| Hookworms | Yes | Yes |
| Whipworms | Yes | Yes |
| Demodex mites | No specific indication | Treatment/control |
| Dosing | Monthly | Monthly |
| Same formulation? | — | No |
What's the main difference?
On parasite coverage, Credelio Plus has significant overlap with Trifexis while adding protection against specified ticks and treatment/control of certain mites.
Both products contain milbemycin oxime, but their second active ingredient is different:
- Trifexis combines milbemycin oxime with spinosad
- Credelio Plus combines milbemycin oxime with lotilaner
That means Credelio Plus is not a generic version or direct pharmaceutical equivalent of Trifexis.
It is a different parasite preventive with overlapping coverage.
For dog owners looking for flea, heartworm and intestinal worm protection while also wanting tick coverage, Credelio Plus is therefore another product worth comparing.
Which Trifexis Alternative Should You Choose?
There isn't one universal replacement for Trifexis because parasite risks differ between dogs and locations.
The simplest way to compare the three products is:
Consider Simparica Trio if: tick protection is important and you want a monthly treatment covering fleas, ticks, heartworm and common intestinal worms.
Consider Credelio Plus if: you want broad monthly parasite coverage including fleas, specified ticks, heartworm and intestinal worms including whipworms.
Trifexis may remain appropriate if: your veterinarian has specifically recommended it for your dog and tick protection is being handled separately or isn't required.
The most important point is that Simparica Trio and Credelio Plus are alternatives to Trifexis — not identical substitutes.
Always select the correct product for your dog's current body weight and follow the product label.
Buying Australian-Market Parasite Prevention From Smartway
Smartway Pet Supplies is an Australian pet retailer supplying genuine Australian-market parasite prevention products to customers internationally.
When you order from Smartway:
- Choose your product based on the parasite protection you require.
- Select the correct weight range for your dog.
- Follow the Australian product label and dosing instructions supplied with the product.
- Your order is dispatched from Australia directly to you.
Our products are genuine, factory-sealed products sourced through Australian supply channels.
Australian veterinary medicines can have different product names, packaging, indications and regulatory classifications from products sold in the United States or Canada.
Customers should also check the rules that apply to importing veterinary products into their own country.
Frequently Asked Questions
Can I buy Trifexis without a prescription?
Trifexis is a prescription veterinary medicine in the United States, so US suppliers dispensing US-market Trifexis generally require a valid veterinary prescription.
Smartway does not sell US-market Trifexis as a way of bypassing that requirement. Smartway is an Australian retailer supplying Australian-market parasite prevention products according to their Australian supply requirements.
What is the closest alternative to Trifexis?
There isn't an exact replacement because different products use different active ingredients and provide different parasite coverage.
Credelio Plus has particularly broad overlap with Trifexis because both cover fleas, heartworm and several intestinal worms, including whipworms, while Credelio Plus also provides specified tick coverage.
Simparica Trio is another strong alternative where flea, tick, heartworm, roundworm and hookworm protection are priorities.
Does Trifexis kill fleas?
Yes. Trifexis contains spinosad, which kills fleas and is used for flea treatment and prevention.
Does Trifexis kill ticks?
No. Trifexis does not provide tick protection.
If your dog needs tick protection, products such as Simparica Trio or Credelio Plus provide specified tick coverage in addition to protection against other parasites.
Is Simparica Trio a generic version of Trifexis?
No.
Trifexis contains spinosad and milbemycin oxime, while Simparica Trio contains sarolaner, moxidectin and pyrantel.
They overlap in some of the parasites they cover, but they are different medications.
Is Credelio Plus the same as Trifexis?
No.
Both contain milbemycin oxime, but Trifexis combines it with spinosad while Credelio Plus combines it with lotilaner.
Their parasite coverage also differs, particularly because Credelio Plus provides specified tick coverage while Trifexis does not.
What does Trifexis cover that Simparica Trio doesn't?
One important difference is whipworms.
Trifexis provides whipworm coverage, while Simparica Trio does not provide the same whipworm indication.
Simparica Trio, however, adds tick protection that Trifexis doesn't provide.
Does Credelio Plus cover whipworms?
Yes. Credelio Plus provides intestinal worm coverage that includes whipworms, making it a closer comparison with Trifexis in this area than Simparica Trio.
Compare Your Options
If you're looking for an alternative to Trifexis, compare the parasite coverage rather than simply looking for a product with a different brand name.
Simparica Trio provides broad monthly flea, tick, heartworm and intestinal worm protection.
Credelio Plus provides broad monthly flea, tick, heartworm and intestinal worm protection, including whipworm coverage.
Neither is a generic version of Trifexis, but both provide overlapping parasite protection and may be worth considering depending on the protection your dog requires.
Product indications and regulatory classifications can differ between countries. Always read and follow the product label supplied with your medication. If you're unsure which parasite preventive is appropriate for your dog, particularly when changing medications or if your dog has an existing medical condition, consult your veterinarian.
Andrew Davies
Founder & Pet Care Specialist — Smartway Pet Supplies
Andrew founded Smartway Pet Supplies to help US and Canadian pet owners access genuine, brand-name parasite prevention medications at fair prices. With years of experience navigating the Australian veterinary products market, he writes practical guides to help pet parents make informed decisions about flea, tick, heartworm, and worming treatments.
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