Side Effects of Frontline Flea Treatment

Frontline is the brand name for the insecticide fipronil, which is applied onto a dog or cat's skin once a month. The fipronil makes the pet's blood harmful to fleas and ticks, but does not harm the pet. Frontline is a prescription medication that can be purchased at a veterinarian's office. However, there are some side effects to be aware of.

Wet Patch of Fur

Because the medication needs to be applied all at one spot in-between the shoulder blades, the patch of fur will be wet for several hours. Some pet owners prefer applying Frontline at night so the pet doesn't try to clean it off.

Hair Loss

According to "The Pill Book Guide to Medication for Your Dog and Ca," another common side effect is hair loss or hair thinning right where the medicine was applied (see Resources).

Skin Irritation

Merial, the manufacturer of Frontline, states that a common side effect is some itchiness or redness on the skin that comes in contact with Frontline (see Resources).

Uncommon Symptoms

Contact your vet immediately if your pet starts vomiting, shaking or has watery diarrhea after Frontline is applied. These are signs of either an overdose or fipronil allergy.

Warning

Never use dog Frontline for cats, because this can kill the cat. Never use adult-strength Frontline for puppies, because that will make them sick.

Resources

• Fipronil (Frontline)
• "The Pill Book Guide to Meedication for Your Dog and Cat"
• Frontline Official Site