Revolution for Dogs
Complete guide to Revolution (selamectin) for dogs: FDA-approved uses, dosage by weight, side effects, drug interactions, cost, and veterinary alternatives.
Revolution (selamectin) requires a veterinarian prescription and should only be used under direct veterinary supervision. Never administer this medication without a valid veterinary-client-patient relationship (VCPR). Your veterinarian must perform a heartworm test before prescribing Revolution for dogs over 6 months of age.
What Is Revolution for Dogs and What Is It Used For?
Revolution is a topical parasiticide containing the active ingredient selamectin, manufactured by Zoetis. It is a broad-spectrum antiparasitic medication applied once monthly to the skin, typically between the shoulder blades. The FDA first approved Revolution for veterinary use in 1999, and it has since become one of the most widely prescribed monthly preventives in small animal practice.
In dogs, Revolution carries FDA approval for the following indications:
- Heartworm prevention (Dirofilaria immitis) — kills third- and fourth-stage larvae before they mature into adult heartworms
- Adult flea control (Ctenocephalides felis) — kills adult fleas and prevents egg production
- Ear mite treatment (Otodectes cynotis) — eliminates infestations with a single dose in most cases
- Sarcoptic mange treatment (Sarcoptes scabiei var. canis) — approved for treatment of sarcoptic mite infestations
- American dog tick control (Dermacentor variabilis) — kills the specified tick species (note: does NOT cover all tick species)
Common off-label uses your veterinarian may discuss include treatment of Cheyletiella mites (walking dandruff) and certain cases of nasal mite infestation (Pneumonyssoides caninum). These off-label applications are supported by clinical experience but lack full FDA labeling for dogs.
Drug Class and Mechanism of Action
How Selamectin Works: Selamectin belongs to the same drug family as ivermectin but is structurally modified for improved topical absorption and safety. After application to the skin, selamectin is absorbed through the skin into the bloodstream and distributed systemically. It binds to glutamate-gated chloride channels (GluCls) found in invertebrate nerve and muscle cells. This binding causes an influx of chloride ions, leading to hyperpolarization of the neuron or muscle cell — effectively paralyzing and killing the parasite. Mammals lack these specific glutamate-gated chloride channels at the peripheral level, which is why selamectin selectively targets parasites without harming your dog's nervous system at therapeutic doses.
Onset of Action: Fleas begin dying within 4–8 hours of application. Full parasiticidal blood levels are achieved within 24–48 hours. Heartworm larvae are eliminated retroactively — selamectin kills L3 and L4 stage larvae that infected your dog in the preceding 30 days.
The pharmacokinetics are worth noting: selamectin reaches peak plasma concentrations approximately 1–3 days after topical application and maintains therapeutic levels for roughly 30 days. The drug has a half-life of approximately 5–7 days in canine plasma, with elimination primarily through fecal excretion.
Typical Dosage of Revolution by Dog Weight
Revolution is dosed at a minimum of 2.7 mg selamectin per pound (6 mg/kg) of body weight, applied topically once every 30 days. Zoetis packages Revolution in color-coded tubes corresponding to specific weight ranges. Your veterinarian will prescribe the correct tube size based on your dog's current weight.
| Tube Color | Dog Weight Range | Selamectin Dose (mg) | Volume (mL) | Avg. Cost per Dose (2026) |
|---|---|---|---|---|
| Pink (Puppy) | Up to 5 lb (2.3 kg) | 15 mg | 0.25 mL | $18–$22 |
| Purple | 5.1–10 lb (2.3–4.5 kg) | 30 mg | 0.5 mL | $19–$24 |
| Brown | 10.1–20 lb (4.5–9 kg) | 60 mg | 1.0 mL | $21–$26 |
| Red | 20.1–40 lb (9–18 kg) | 120 mg | 2.0 mL | $23–$28 |
| Teal | 40.1–85 lb (18–38.5 kg) | 240 mg | 3.0 mL | $25–$32 |
| Plum | 85.1–130 lb (38.5–59 kg) | 240 mg (larger volume) | Varies | $28–$35 |
Important: Never combine multiple smaller tubes to dose a larger dog, and never split a single tube between dogs. Each tube is calibrated for a specific weight range and volume. For dogs over 130 lb, your veterinarian will prescribe the appropriate combination of tubes.
How to Apply Revolution: Administration Instructions
Proper application ensures full absorption and efficacy. Follow these steps precisely:
- Part the hair at the base of the skull (between the shoulder blades) until the skin is clearly visible.
- Place the applicator tip directly on the skin — not on top of the fur. The medication must contact skin to be absorbed.
- Squeeze the entire contents in one spot. Do not spread or massage the liquid.
- Allow the site to dry naturally — this typically takes 2–4 hours. Do not cover the site with a bandage or clothing.
- Wash your hands thoroughly with soap and water after application.
Timing and frequency: Apply once every 30 days, ideally on the same calendar date each month. Revolution can be applied with or without food — oral intake does not affect absorption since the drug is absorbed transdermally.
Bathing considerations: Revolution remains effective if your dog is bathed or swims 2 hours or more after application. According to Zoetis efficacy data, bathing at 2 hours post-application does not significantly reduce blood concentrations. However, frequent bathing (more than once per week) with medicated or harsh shampoos may reduce efficacy over time. Discuss your dog's bathing routine with your veterinarian.
Duration of treatment: Heartworm prevention is a lifelong commitment in endemic areas (which includes most of the continental United States). Flea control may be seasonal depending on your climate, but many veterinarians recommend year-round prevention. Sarcoptic mange treatment typically requires two doses administered 30 days apart, with a follow-up skin scraping to confirm clearance.
Side Effects of Revolution in Dogs
Revolution is generally well-tolerated, with adverse reactions reported in less than 1% of treated dogs in pre-approval field studies. However, as with any medication, side effects can occur. Understanding the frequency and severity helps you monitor your dog appropriately.
| Side Effect | Frequency | Severity | Typical Onset |
|---|---|---|---|
| Application site irritation (redness, hair loss) | <1% | Mild | Within 24 hours |
| Vomiting | <1% | Mild | Within 24 hours |
| Diarrhea | <1% | Mild | Within 24–48 hours |
| Lethargy / decreased activity | <1% | Mild to moderate | Within 24 hours |
| Decreased appetite | <1% | Mild | Within 24 hours |
| Drooling (if licked) | Rare | Mild | Immediately if licked |
| Neurological signs (tremors, ataxia, seizures) | Very rare | Serious | Within 24–72 hours |
| Anaphylaxis (facial swelling, hives, collapse) | Very rare | Serious | Within minutes to hours |
- Tremors, muscle twitching, or uncoordinated movement (ataxia)
- Seizures or loss of consciousness
- Facial swelling, hives, or difficulty breathing
- Excessive drooling that does not resolve within 1–2 hours
- Profound lethargy lasting more than 24 hours after application
- Vomiting or diarrhea persisting beyond 24 hours
If you suspect an overdose or severe reaction, contact ASPCA Animal Poison Control: (888) 426-4435 (24/7, consultation fee applies) or the Pet Poison Helpline: (855) 764-7661.
Contraindications and Drug Interactions
While Revolution has a wide safety margin, certain dogs should not receive this medication, and some drug combinations require caution.
Contraindications — Dogs Who Should NOT Receive Revolution
- Puppies under 6 weeks of age — safety has not been established in neonates
- Dogs with known hypersensitivity to selamectin or any component of the formulation
- Sick, debilitated, or underweight dogs — use with caution and only under close veterinary supervision. Your veterinarian will assess whether the benefits outweigh the risks in dogs with significant systemic illness.
MDR1 gene mutation consideration: Certain herding breeds — including Collies, Australian Shepherds, Shetland Sheepdogs, and related breeds — may carry a mutation in the ABCB1 (MDR1) gene that affects the blood-brain barrier's ability to exclude macrocyclic lactones. While selamectin has been tested at 10× the recommended dose in avermectin-sensitive Collies without adverse effects (per Merck Veterinary Manual), many veterinarians recommend MDR1 genetic testing through the Washington State University Veterinary Clinical Pharmacology Laboratory before starting any macrocyclic lactone in these breeds.
Drug Interaction Grid
| Concurrent Medication | Interaction Risk | Clinical Significance | Veterinary Guidance |
|---|---|---|---|
| Other macrocyclic lactones (ivermectin, milbemycin, moxidectin) | Moderate | Additive neurotoxicity risk | Do NOT combine; choose one preventive |
| Spinosad (Comfortis, Trifexis) | Moderate | May lower seizure threshold when combined | Discuss alternatives with your vet |
| Isoxazolines (NexGard, Bravecto, Simparica) | Low to moderate | Both drug classes can cause neurological ADRs; overlapping risk in seizure-prone dogs | Caution in dogs with seizure history |
| Ketoconazole, itraconazole (antifungals) | Low | May inhibit P-glycoprotein, increasing selamectin CNS exposure | Monitor closely; vet may adjust protocol |
| Corticosteroids (prednisone, dexamethasone) | Low | No significant direct interaction; concurrent immunosuppression may affect parasite clearance | Generally safe; vet will monitor |
| Heartworm adulticide therapy (melarsomine) | High | Revolution should NOT be used as a substitute for adulticide protocol in heartworm-positive dogs | Follow AHS heartworm treatment guidelines |
Monitoring Requirements and Follow-Up
Revolution is a low-maintenance preventive, but responsible use requires some baseline and ongoing monitoring.
- Before starting: Heartworm antigen test (dogs ≥6 months old). Cost: $35–$65 at most clinics. Starting a preventive in a heartworm-positive dog can cause a severe reaction from dying microfilariae.
- Annual heartworm testing: Even on year-round prevention, the American Heartworm Society recommends annual testing to catch breakthrough infections early.
- Weight checks: Every 6–12 months. Growing puppies and dogs that gain or lose significant weight may need a tube size adjustment.
- Fecal examination: Annually (or as recommended by your vet). Revolution does NOT protect against intestinal parasites like roundworms, hookworms, whipworms, or tapeworms.
- Post-treatment mange check: If treating sarcoptic mange, a skin scraping at 30–60 days after the second dose confirms mite elimination.
Missed Dose and Overdose Protocol
If you miss a monthly dose: Apply Revolution as soon as you remember, then resume your regular monthly schedule from that new date. Because selamectin kills heartworm larvae retroactively (eliminating L3 and L4 stages from the preceding 30 days), a single missed dose by a few days typically does not leave your dog unprotected. However, if the gap exceeds 45–60 days, consult your veterinarian — they may recommend a heartworm test before resuming and may suggest more aggressive monitoring.
If an overdose occurs: Overdosing (e.g., applying a large-dog tube to a small dog) increases the risk of neurological side effects. Symptoms of selamectin overdose include dilated pupils, tremors, ataxia, depression, salivation, and in severe cases, coma. There is no specific antidote; treatment is supportive. If you realize you've applied the wrong dose, contact your veterinarian or ASPCA Animal Poison Control at (888) 426-4435 immediately. Do not attempt to wash off the medication after it has been absorbed (beyond the first 30 minutes), as this is largely ineffective once transdermal absorption has begun.
Cost, Availability, and Alternatives to Revolution
Revolution is available exclusively through licensed veterinarians and authorized veterinary pharmacies. As of 2026, a 6-month supply typically costs between $110 and $200 depending on your dog's weight class and the dispensing pharmacy. A 12-month supply ranges from $200 to $380.
Generic availability: Selamectin is now available in generic formulations from several manufacturers. Generic selamectin products approved by the FDA include Revolution Pet (different packaging, same formulation) and various pharmacy-compounded equivalents. Generic versions typically cost 15–25% less than brand-name Revolution. Your veterinarian can advise whether a generic equivalent is appropriate for your dog.
Important: Never purchase Revolution or any prescription parasiticide from unauthorized online retailers, foreign websites, or marketplaces that do not require a veterinary prescription. The FDA warns that counterfeit parasiticides are a documented problem, and these products may contain incorrect active ingredients, wrong concentrations, or no active ingredient at all.
Alternatives to Revolution: Comparison
| Product | Type | Heartworm | Fleas | Ticks | Intestinal Parasites | Mites |
|---|---|---|---|---|---|---|
| Revolution (selamectin) | Topical | ✅ | ✅ | Partial (D. variabilis only) | ❌ | ✅ Ear + Sarcoptic |
| Revolution Plus (selamectin + sarolaner) | Topical | ✅ | ✅ | ✅ Broader tick coverage | ❌ | ✅ Ear + Sarcoptic |
| Heartgard Plus (ivermectin + pyrantel) | Oral chew | ✅ | ❌ | ❌ | ✅ Roundworm + Hookworm | ❌ |
| Simparica Trio (sarolaner + moxidectin + pyrantel) | Oral chew | ✅ | ✅ | ✅ Broad spectrum | ✅ Roundworm + Hookworm | ❌ |
| NexGard PLUS (afoxolaner + moxidectin + pyrantel) | Oral chew | ✅ | ✅ | ✅ Broad spectrum | ✅ Roundworm + Hookworm | ❌ |
| Interceptor Plus (milbemycin + praziquantel) | Oral chew | ✅ | ❌ | ❌ | ✅ Roundworm, Hookworm, Whipworm, Tapeworm | ❌ |
Revolution's unique advantage over most competitors is its mite coverage — it is one of the few monthly preventives that treats ear mites and sarcoptic mange. However, it lacks intestinal parasite protection, which means many veterinarians pair Revolution with a separate dewormer or recommend switching to an all-in-one product like Simparica Trio if intestinal parasite coverage is a priority in your area.
Frequently Asked Questions About Revolution for Dogs
Can I use Revolution for cats on my dog?
No. While the active ingredient (selamectin) is the same, the formulation concentrations and vehicle differ between the canine and feline products. Using a cat-labeled product on a dog may result in underdosing or improper absorption. Always use the product specifically labeled for your species.
Is Revolution safe for pregnant or nursing dogs?
Yes. Selamectin has been evaluated for safety in breeding, pregnant, and lactating dogs at doses up to 4× the recommended amount with no adverse effects on reproductive performance or puppy health. However, always inform your veterinarian if your dog is pregnant or nursing before starting any medication.
Does Revolution protect against all types of ticks?
No. Revolution is only FDA-approved for the American dog tick (Dermacentor variabilis). It does not provide reliable protection against the black-legged tick (Lyme disease vector), Lone Star tick, or brown dog tick. If you live in an area with significant tick-borne disease risk, your veterinarian will likely recommend a product with broader tick coverage, such as Revolution Plus, Simparica Trio, or a separate oral isoxazoline.
My dog licked the application site — is this dangerous?
Accidental licking typically causes transient drooling due to the bitter taste of the formulation vehicle, not the active ingredient itself. This is not a toxic exposure at the volumes involved. Offer your dog water and monitor. If drooling persists beyond 30 minutes or if your dog shows any neurological signs, contact your veterinarian.
How long does my dog need to be on Revolution?
Heartworm prevention should be administered year-round for the life of your dog, according to the American Heartworm Society. Flea and tick prevention duration depends on your geographic region and your dog's exposure risk. Your veterinarian will tailor a protocol based on your location, lifestyle, and your dog's individual health profile.
Can Revolution cause seizures in dogs?
Neurological adverse events, including seizures, are classified as very rare with selamectin. The FDA issued a 2018 safety alert regarding neurological adverse events across the isoxazoline class (different drug class), but selamectin itself has a long safety record. Dogs with a pre-existing seizure disorder should be discussed with your veterinarian before starting any parasiticide, as the decision involves weighing individual risk factors.
This guide is intended for educational purposes and does not replace professional veterinary advice. Always consult your veterinarian before starting, changing, or discontinuing any prescription medication for your dog. Your veterinarian is the only qualified professional who can determine the appropriate preventive protocol based on your dog's health history, lifestyle, and regional parasite risks.
Priya Sutaria
All our authors care for dogs every day — read more of their work on the authors page.
