Revolution for Dogs: Complete 2026 Medication Guide
Guide to Revolution for dogs: dosage, side effects, drug interactions, and cost. Learn how this prescription parasiticide works and when to use it.
What Is Revolution for Dogs?
Revolution (selamectin) is a prescription-only topical parasiticide manufactured by Zoetis. It's a broad-spectrum medication that prevents and treats multiple external and internal parasites in dogs. Available as a monthly spot-on treatment, Revolution has been a mainstay in veterinary parasitology since its FDA approval in 1999.
Drug Class and Mechanism of Action
Revolution belongs to the avermectin class of antiparasitic drugs. Selamectin, the active ingredient, is a macrocyclic lactone that works by binding to glutamate-gated chloride ion channels in invertebrate nerve and muscle cells. This binding increases cell membrane permeability to chloride ions, causing hyperpolarization, paralysis, and death of the parasite.
How it works in simple terms: When applied to your dog's skin, selamectin is absorbed into the bloodstream and distributed throughout the body. Parasites that feed on your dog's blood or tissue are exposed to the drug, which disrupts their nervous system function. Mammals (including dogs and humans) have different chloride channel structures, making selamectin selectively toxic to parasites while remaining safe for pets at recommended doses.
FDA-Approved Uses and Off-Label Applications
Revolution carries FDA approval for the following indications in dogs 6 weeks of age and older:
- Heartworm prevention (Dirofilaria immitis)
- Flea treatment and prevention (Ctenocephalides felis) — kills adult fleas, prevents egg hatching
- Ear mite treatment (Otodectes cynotis)
- Sarcoptic mange treatment (Sarcoptes scabiei)
- American dog tick control (Dermacentor variabilis)
Common Off-Label Uses
Veterinarians may prescribe Revolution off-label for:
- Cheyletiellosis (walking dandruff mites)
- Demodectic mange (Demodex canis) — though efficacy is lower than dedicated treatments
- Certain cases of nasal mites (Pneumonyssoides caninum)
Typical Dosage Range by Weight
Revolution is dosed based on body weight and comes in pre-measured applicator tubes. The recommended dose is 2.7 mg/lb (6 mg/kg) applied topically once monthly.
| Dog Weight Range | Selamectin Dose (mg) | Applicator Color | Volume (mL) |
|---|---|---|---|
| 5.1–10 lb | 15 mg | Purple | 0.5 |
| 10.1–20 lb | 30 mg | Brown | 1.0 |
| 20.1–40 lb | 60 mg | Red | 1.0 |
| 40.1–85 lb | 120 mg | Teal | 2.0 |
| 85.1–130 lb | 240 mg (2 tubes) | Teal (×2) | 2.0 × 2 |
For dogs over 130 lb, your veterinarian will calculate the appropriate combination of applicators to achieve the 6 mg/kg dose.
Administration Instructions
Apply Revolution directly to the skin at the base of the neck, in front of the shoulder blades. Part the hair until you see skin, then place the applicator tip directly on the skin and squeeze the entire contents in one spot. Do not massage the product into the skin.
Key Administration Guidelines
- Frequency: Once every 30 days, year-round for heartworm prevention
- With/without food: No restrictions — can be applied regardless of feeding schedule
- Bathing: Bathing or swimming 2+ hours after application does not reduce effectiveness
- Duration: Continuous monthly use recommended; for sarcoptic mange, two monthly doses may be required
Wash your hands thoroughly with soap and water after application. Avoid contact with the application site for 2 hours post-treatment.
Side Effects: What to Watch For
Revolution is generally well-tolerated, but like all medications, side effects can occur. Clinical trials and post-market surveillance have identified the following adverse events:
| Side Effect | Reported Frequency | Severity |
|---|---|---|
| Temporary hair loss at application site | ~1–2% | Mild |
| Salivation/drooling | ~1% | Mild |
| Vomiting | <1% | Mild |
| Diarrhea | <1% | Mild |
| Lethargy | <1% | Mild to Moderate |
| Anorexia | <1% | Mild |
| Seizures (rare) | <0.1% | Serious |
| Ataxia/incoordination | <0.1% | Serious |
Serious Side Effects Requiring Immediate Veterinary Attention
Contact your veterinarian or emergency clinic immediately if your dog exhibits:
- Seizures or tremors
- Severe lethargy or collapse
- Difficulty walking or standing
- Excessive drooling that persists beyond 30 minutes
- Dilated pupils or vision changes
- Vomiting that occurs repeatedly
ASPCA Animal Poison Control: (888) 426-4435 (24/7, consultation fee applies)
Contraindications: Dogs Who Should Not Receive Revolution
Revolution should NOT be used in:
- Puppies under 6 weeks of age — safety not established
- Dogs with known hypersensitivity to selamectin or avermectins
- Sick, debilitated, or underweight dogs — use only under close veterinary supervision
Breed-Specific Considerations
Certain herding breeds carry the MDR1 (ABCB1) gene mutation, which affects the blood-brain barrier and can increase sensitivity to avermectin-class drugs. Breeds at higher risk include:
- Collies (rough and smooth)
- Australian Shepherds
- Shetland Sheepdogs
- Old English Sheepdogs
- German White Shepherds
While Revolution is considered safe for MDR1-mutant dogs at labeled doses (unlike ivermectin at high doses), your veterinarian may recommend MDR1 genetic testing through Washington State University's Veterinary Clinical Pharmacology Lab before prescribing.
Drug Interactions
Selamectin has a relatively low interaction profile, but certain combinations warrant caution:
| Concurrent Medication | Interaction Risk | Recommendation |
|---|---|---|
| Other avermectins (ivermectin, milbemycin) | Moderate | Avoid concurrent use; cumulative CNS effects possible |
| Spinosad (Comfortis, Trifexis) | Low–Moderate | Monitor for tremors; some reports of increased neurological events |
| Ketoconazole, itraconazole | Low | No dose adjustment typically needed, but monitor |
| Corticosteroids | Low | Generally safe; no significant interactions reported |
| NSAIDs (carprofen, meloxicam) | Low | Generally safe for concurrent use |
Always disclose all medications, supplements, and over-the-counter products your dog is receiving to your veterinarian before starting Revolution.
Monitoring Requirements
For most dogs, Revolution requires minimal monitoring beyond routine wellness exams. However, specific situations warrant additional oversight:
Standard Monitoring Protocol
- Baseline: Heartworm antigen test before starting (dogs 7+ months of age)
- Annual: Heartworm test during yearly wellness exam, even with continuous prevention
- Follow-up for mange: Skin scraping 4 weeks after treatment to confirm mite elimination
- Ear mites: Otoscopic exam 2–4 weeks post-treatment
If your dog has the MDR1 mutation or is on multiple medications, your veterinarian may recommend more frequent neurological assessments during the first few months of treatment.
Cost and Availability
Revolution is available by prescription only through licensed veterinarians and authorized online pharmacies (e.g., Chewy Pharmacy, 1-800-PetMeds with valid prescription).
2026 Pricing Ranges
- 6-month supply: $75–$110 depending on weight range
- 12-month supply: $140–$200
- Per-dose cost: $12–$18 per monthly application
Generic Availability
As of 2026, selamectin is available in generic formulations (e.g., Revolt, Stronghold for dogs in some markets). Generic versions typically cost 15–25% less than brand-name Revolution. Confirm with your veterinarian that any generic product carries FDA approval and is appropriate for your dog.
Missed Dose and Overdose Protocols
If You Miss a Dose
Apply Revolution as soon as you remember, then resume the monthly schedule from that new date. For heartworm prevention, the American Heartworm Society recommends testing if the gap exceeds 2 months.
If Overdose Occurs
Signs of selamectin overdose may include:
- Excessive salivation
- Tremors or muscle twitching
- Ataxia (uncoordinated movement)
- Depression or lethargy
- In severe cases: seizures, coma
If you suspect overdose, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately. Bring the product packaging to help determine the exact dose administered.
Frequently Asked Questions
How long does my dog need to be on Revolution?
For heartworm prevention, year-round monthly use is recommended in all 50 states, as mosquitoes can be active during unseasonably warm periods. For flea and tick control, continuous use during parasite season (or year-round in warmer climates) provides best protection. Treatment of ear mites or sarcoptic mange typically requires 1–2 monthly doses, after which your veterinarian will reassess.
Are there alternatives to Revolution?
Yes. Depending on your dog's needs, alternatives include:
- Simparica Trio — oral chewable covering heartworm, fleas, ticks, and some mites
- Advantage Multi — topical with imidacloprid + moxidectin (heartworm, fleas, mange, hookworm, roundworm)
- NexGard — oral flea and tick only (no heartworm coverage)
- Heartgard Plus — oral heartworm and intestinal parasites only (no flea/tick)
Your veterinarian will recommend the best option based on your dog's parasite risk, lifestyle, and health status.
Can I use Revolution on a pregnant or nursing dog?
Yes. Revolution has been evaluated for safety in breeding, pregnant, and lactating dogs and is approved for use in these populations. However, always confirm with your veterinarian before administering any medication to pregnant animals.
Is Revolution safe for cats?
Revolution is available in a separate feline formulation with different dosing. Never use the dog formulation on cats, as the concentration and volume differ. Always use species-specific products.
Does Revolution protect against all ticks?
No. Revolution is labeled for the American dog tick (Dermacentor variabilis) only. It does not provide reliable protection against black-legged ticks (Ixodes scapularis, which transmit Lyme disease) or Lone Star ticks (Amblyomma americanum). If your dog is at risk for these species, your veterinarian may recommend a supplemental tick preventive.
When to Consult Your Veterinarian
While Revolution is a well-established and effective parasiticide, every dog is an individual. Consult your veterinarian if:
- Your dog has a history of seizures or neurological conditions
- Your dog is of a herding breed and has not been MDR1 tested
- You observe any adverse reactions after application
- Your dog weighs less than 5 lb (dosing may require compounding)
- You're considering switching from another preventive medication
This guide provides educational information only and does not replace professional veterinary advice. Always consult your veterinarian before starting, stopping, or changing any medication regimen for your dog.
Dr. Hannah Wickes
All our authors care for dogs every day — read more of their work on the authors page.
