Your cat can recover from three viruses.

Feline Calicivirus (FCV) is one of the most common viral infections in cats. It usually shows up as painful ulcers in the mouth or on the tongue, heavy drooling, sneezing and a loss of appetite. Cats often stop eating because their mouth hurts, not because they are not hungry.

Feline Chronic Gingivostomatitis (FCGS) is severe, long-running inflammation of the gums and the mouth. Many cats with Feline Chronic Gingivostomatitis (FCGS) also carry Feline Calicivirus (FCV), which is why the two are treated together. Cats with this condition often drool, drop food from their mouth, or refuse hard food entirely.

With CaliciX or CaliciX Max, oral antiviral treatments for Feline Calicivirus (FCV) and Feline Chronic Gingivostomatitis (FCGS). CaliciX uses an EIDD-1931 based formula. Our specialists will tell you which of the two fits your cat's case, free of charge.

No. CaliciX and CaliciX Max are oral capsules you give at home. There is no injectable protocol for Feline Calicivirus (FCV), so if your cat is difficult to handle or you are not comfortable with needles, that is not a problem here.

No. The Dosage Calculator is built for the GS-441524 protocol for Feline Infectious Peritonitis (FIP) only. Dosing for CaliciX is handled by our specialists when you contact them, so do not use the calculator numbers for it.

Other cats yes, you no. Feline Calicivirus (FCV) spreads easily between cats through saliva and nasal discharge, and through shared bowls, bedding and grooming, which is why it moves quickly through multi-cat homes, shelters and catteries. It does not infect people.

You cannot tell from sneezing alone, and this is the most common thing cat owners get stuck on. Both viruses cause it. What usually separates them is where else the trouble shows: mouth ulcers and drooling point towards Feline Calicivirus (FCV), while watery or crusted eyes and congestion point towards Feline Herpesvirus (FHV-1). Send your cat's symptoms to our specialists and they will help you work out which one you are dealing with, free of charge.

Feline Herpesvirus (FHV-1) is the most common cause of upper respiratory infection in cats. The usual signs are constant sneezing, watery or crusted eyes, nasal congestion and squinting.

With HerpX, an oral capsule containing famciclovir, 180 mg per capsule, 60 capsules per bottle. Send your cat's symptoms to our specialists and they will set the plan with you, free of charge.

Once a cat is infected, Feline Herpesvirus (FHV-1) stays in the body for life. It can go quiet for long stretches and then flare up again during stressful periods: a move, a new pet, boarding, illness. This is why treatment focuses on controlling flare-ups rather than clearing the virus, and why a cat that has had it once may need treatment again later.

No. HerpX is an oral capsule you give at home. There is no injectable protocol for Feline Herpesvirus (FHV-1).

No. The Dosage Calculator is built for the GS-441524 protocol for Feline Infectious Peritonitis (FIP) only. Dosing for HerpX is handled by our specialists when you contact them.

Other cats yes, you no. Feline Herpesvirus (FHV-1) spreads between cats through sneezing and through eye and nasal discharge, including on shared bowls and bedding. It does not infect people.

You cannot tell from sneezing alone. Both viruses cause it. Watery or crusted eyes and nasal congestion point towards Feline Herpesvirus (FHV-1), while mouth ulcers and heavy drooling point towards Feline Calicivirus (FCV). Send your cat's symptoms to our specialists and they will help you work out which one you are dealing with, free of charge.

Feline Infectious Peritonitis (FIP) is a viral disease caused by a mutated feline coronavirus. It is fatal without treatment. Antiviral treatment with GS-441524 changed that: it has a 92% clinical success rate in the UC Davis clinical trial, and our specialists have run the protocol since 2019.

Most cats show visible improvement within the first 5 days of treatment. Appetite usually returns first, then energy. Improvement in the first week is not the finish line though: the full course still has to be completed, or the infection can come back.

84 days. The protocol runs for 12 weeks without gaps, even after your cat looks well again, which is usually long before day 84. Stopping early is the most common reason treatment fails.

GS-441524 injections are our most used option and suit all types of Feline Infectious Peritonitis (FIP), including severe cases. GS-441524 oral capsules suit cats that are sensitive to injections or owners who are not comfortable injecting daily at home. EIDD-1931 oral capsules are used in the dual antiviral protocol. Our specialists will recommend which fits your cat's case, free of charge.

Yes. The protocol covers all types of Feline Infectious Peritonitis (FIP): wet, dry, neurological and ocular. Neurological and ocular cases are dosed differently from wet and dry cases, so tell our specialists exactly what your vet found, including any wobbling, seizures, or changes in the eyes.

If your cat becomes reinfected with Feline Infectious Peritonitis (FIP) within 12 months of finishing the protocol, you get 50% off the treatment for the relapse. Full terms are on the Relapse Guarantee page.

Yes. Share your cat's diagnosis and symptoms and our specialists will recommend a treatment plan at no charge, whether you buy from us or not. Most enquiries get a reply within hours.