Switching Flea, Tick & Worm Products Safely: A Simple Timing Guide

Why timing matters
A clean switch prevents gaps in cover and avoids doubling the same active. The safest rule is simple. Start the new product when the old product’s protection period finishes.

Before you switch

• Check the date of the last dose.

• Weigh your pet and choose the correct pack.

• Decide on your preferred application. Chew or spot-on.

• Read the label for both products so you know the coverage period and any special directions.

Safe timing snapshots

• Monthly chew to long-acting chew (dogs): Give the long-acting chew on the day the next monthly dose would be due.

• Long-acting chew to monthly chew (dogs): Start the monthly chew when the long-acting coverage ends, based on the label period.

• Chew to spot-on: Apply the spot-on when the chew is next due. Keep the site dry as per the label.

• Spot-on to chew: Give the chew when the spot-on’s protection period finishes.

• Cats switching between monthly and long-acting spot-ons: Apply the new product when the previous product would have been due.

If your pet has a medical condition, is on other medicines, or you live in a high tick risk area, ask your vet for tailored timing.

Products that fit common switch paths

• Dogs, broad monthly chew: Simparica Trio chewable tablet for dogs

• Dogs, long-acting chew: Bravecto chew for dogs

• Cats, broad monthly spot-on with tick cover: Revolution Plus spot-on for cats

• Cats, long-acting spot-on: Bravecto spot-on for cats

Simple safety rules

• Use species-specific products only. Never use dog products on cats.

• Do not combine treatments unless your vet advises it.

• Match the correct weight band each time.

• Keep spot-ons away from children and other pets until dry.

• Set phone reminders so you do not miss dates.

Troubleshooting

• Missed or late dose: Give it as soon as you remember, then reset your schedule from that date.

• Cannot confirm the last dose date: Start today and set new reminders. If you think a dose may have been given very recently, ask your vet before dosing.

• Skin still itchy after switching: Treat every pet in the home, wash bedding hot, vacuum often, and give two to three weeks for skin to settle. See your vet if there is broken skin or infection.

FAQ

Can I overlap products for extra protection
Do not overlap without vet advice. You can double the same active by mistake. The clean switch method is start the new product when the old one finishes.

How soon can I bathe after a spot-on
Follow the label wait time. Apply to clean, dry skin and let it dry fully before bathing or swimming.

Can I switch back later
Yes. Use the same rule. Begin the new product when the current one finishes. Keep a simple calendar so dates are clear.

Need help planning your switch
Share your pet’s age, weight and current product. Our vet-led team will map out safe timing for your home. Contact us.