We all want to protect our pets from fleas and ticks, and our homes from flea infestations. There are many great products out there right now, like Advantix and Frontline Plus, that makes doing so easy, like spot-on that kill adult fleas and ticks and stop the growth of new fleas. But what if a medication no longer seems to be working well or you want extra protection for your pet—is it safe to add a second flea and tick medication?
Every pet is different. The right product(s) for one pet might not be right for another pet, which is why having guidelines is important in making the best choices for your best friend. Some pets might do well with Advantage Multi for cats and others with Nexgard. Below are some tips to help you protect your pets.
How to Find the Right Combination
Always read product labels, particularly the drug interaction sections, if you intend to combine products, and check with your vet before combining products.
Products that only treat fleas are generally safe to combine with products that only treat ticks. But similar to how some people can have different reactions to combinations of medication—pets can react differently to combinations of medications. Your pet might have special medical conditions that only a veterinarian would know. Again, consult your veterinarian before combining medications.
Combinations to Know: Oral Flea Treatments
Either Capstar or Comfortis can be combined individually with a variety of other flea and tick medications including one of the following: K9 Advantix II, Frontline Plus for Dogs, Advantage II for Dogs, Revolution for dogs, Pet Armor for Dogs, Advantage Multi, Frontline Top Spot for Dogs, Sentinel, or Farnam Bio Spot for Dogs. Capstar will knock out a flea infestation quickly and is over the counter. Comfortis requires a prescription and works to kill adult fleas for a month.
It’s not usually recommended to use more than one oral flea medication at the same time. However, Comfortis and Capstar can be combined. Another exception is Sentinel, which doesn’t kill adult fleas, so it can be combined individually with either Comfortis or Capstar.
Combinations to Know: Flea Collars
Some flea collars, like Preventic, are generally safe to combine individually with one of the following: Frontline Plus, Revolution, Pet Armor, Frontline Top Spot or Farnam Bio Spot, K9 Advantix II, Advantage II, Trifexis, Interceptor, Certifect, or Advantage Multi. When used in conjunction with one of the above medications, Preventic collars have been shown to be effective for flea and tick prevention, particularly tick prevention. A good time to use a collar like Preventic with your normal preventative is if you're going for a deep woods hike with your dog. You can remove the collar after the hike! Talk to your vet before combining a Seresto flea collar with any other medications.
Combinations to Know: Heartworm Medication
If you’re concerned about combining heartworm medication with flea and tick products, Heartgard is a good choice, as it doesn’t target fleas or ticks. This means that it can usually be safely combined with other flea and tick medications. However, Heartgard is not safe to combine with a flea and tick medication if that second medication also contains heartworm medication.
Combinations Not to Use
Here are some examples of common medications that should never be combined: Frontline Plus should not be combined with Advantage II; Advantage Multi should not be combined with Revolution; with the exception of Capstar or the Preventic collar, Advantage Multi should not be combined other medications. Frontline products should not be used in conjunction with Advantage or Advantix products.
Your pet shouldn’t receive a flea bath if they have recently been introduced to another flea or tick treatment (for example, if your pet was treated with a spot on in the past month). If your pet is given a flea bath, they shouldn’t receive another medication for a few days after—Capstar is a more flexible, reliable alternative to flea baths.
Flea and tick treatments that are applied to the surrounding environment—either outdoors or in your home, usually won't conflict with medications given directly to your pet. Just try to be mindful of where you're aiming the treatment (don’t spray your pet)!
Some Final Tips
Using more than the recommended dosage of any individual medication is never advisable. This is not limited to prescription flea and tick medications. In fact, over-the-counter medications can present greater risks when more than the recommended quantity is given to your pet. In particularly bad flea or tick infestations, certain products recommended for monthly use might be used every three weeks under the advice and supervision of your vet.
Aside from any of the above exceptions, it is not recommended to combine medications that are designed to target the same problems (in essence, “doubling up” on certain types of products). For example, it is not safe to use more than one spot-on flea and tick medication during the time that the product is still active more than one oral flea and tick medication, or more than one product that contains heartworm medication at the same time. Consult your veterinarian if you’re not sure about a medication choice.
Will I Overmedicate My Pet if I Mix Flea Meds?
We can't say it enough. Read and follow the package instructions for any and all medications you give your pet. Even over-the-counter products can be dangerous if misused or combined with the wrong products (the label should mention potential drug interactions), so read those labels and always ask your vet if you have any questions.
Don’t Play Pharmacist
When it comes to flea and tick medicine, pet owners are often looking for a quick fix. In reality, it can take three months or more to completely rid your pet of a flea’s full life cycle. (Capstar is a good quick way to knock out an adult infestation should one occur, but it won't deal with the complete flea life cycle). Don’t let human impatience harm your pet. Allow the medication to completely work its way into your pet’s system before sounding the alarm. Whatever you do, don’t take dosage matters into your own hands. Overmedicating your animal or not following weight /dosage guidelines can really harm your pet.
If your pet is battling a serious case of flea infestation consider adding Capstar or a flea collar. Collars will help kick start the healing process by moving fleas away from the head and neck and down to the rear of the body--not a total fix but it should provide some relief. Read this article to learn more about what flea and tick products can be combined. And again, always check with your vet if you have questions about which products to use and combine for your pet.
How PetPlus Can Help
When it comes to protecting your dog from fleas and ticks, PetPlus is the best way to provide them with the medications they need. Everything from topicals like K9 Advantix II and Frontline Plus to collars like Seresto is right at your fingertips, and with savings, you are going to love -- some as high as 65% off!
Frequently Asked Questions
Can you combine flea treatments?
It is generally not recommended to combine different flea treatments unless specifically advised to do so by a veterinarian. Flea treatments come in a variety of forms, such as spot-on treatments, shampoos, oral medications, and sprays, and each may contain different active ingredients. When different flea treatments are combined, there is a risk of over-treating the animal, which can be harmful. Additionally, some active ingredients in flea treatments may interact with each other, which can also be harmful.
What happens if I give my dog two flea treatments?
Giving your dog two flea treatments at the same time can be dangerous. As mentioned, different flea treatments can contain different active ingredients, and when these are combined, there is a risk of over-treating your dog. Over-treating can lead to a number of adverse reactions. Some dogs may experience redness, itching, or rash on their skin as a result of the increased concentration of active ingredients. Certain active ingredients in flea treatments can cause neurological side effects such as tremors, seizures, or even death. Additionally, if you're applying two different spot-on treatments, one of the active ingredients might be neutralized or inactivated by the other, making it less effective.
How close together can you do flea treatments?
The recommended time frame for administering flea treatments can vary depending on the specific product you are using. Some flea treatments are intended for monthly use, while others may be used every three months. It is important to read the product label carefully and follow the instructions for use. In general, it is generally not recommended to administer flea treatments more frequently than once per month, as this can increase the risk of over-treating your pet. If you are using a monthly treatment and are still seeing fleas on your pet, it may be a sign that the treatment is not working effectively or that there is a high infestation level in your environment. In these cases, it is best to consult with your veterinarian to determine the best course of action.
What happens if you give flea medicine too close together?
Giving flea medicine too close together can lead to a number of adverse reactions in your pet, as it increases the risk of over-treating them. Your pet may experience redness, itching, or rash on its skin as a result of the increased concentration of active ingredients. Certain active ingredients in flea treatments can cause neurological side effects such as tremors, seizures, or even death in severe cases. Additionally, some active ingredients in flea treatments may interact with each other when combined, which can also be harmful. When flea treatments are administered too close together, the increased concentration of active ingredients can make the treatment less effective, as the fleas may be resistant to the treatments.
Can I use flea treatment again after 2 weeks?
The recommended time frame for administering flea treatment can vary depending on the specific product you are using. Some flea treatments are intended for monthly use, while others may be used every three months. If you are using a monthly treatment and you notice fleas on your pet after two weeks, it may be a sign that the treatment is not working effectively or that there is a high infestation level in your environment. In these cases, it is best to consult with your veterinarian to determine the best course of action.
More Flea and Tick Control Advice
The Flea Life Cycle
How to Kill Fleas in the Yard
Flea and Tick Season: When to Use What Treatment
How Do Flea Collars Work?
Oral Flea Control: Flea Pills For Dogs And Cats