Antiviral brands for FIP
The brands most used in Spain to treat feline FIP with GS-441524. Objective information on concentration, presentations and dosing. No commercial affiliation.
Important notice: in Spain there is no antiviral authorised to treat FIP. In other countries, such as France or the United Kingdom, it can be obtained legally through compounding pharmacies with a veterinary prescription. Its use is the responsibility of the prescribing vet and of the owner. Always verify the origin and concentration of any product before giving it.
Options available in Spain
The three injectable GS-441524 brands most used by the Spanish PIF Warriors community.
Lanzi
Oral availableAvailable in injectable vials and oral capsules. The only one of the three brands offering both, which makes it a flexible option where the daily injection is difficult.
Lucky
Injectable onlyInjectable vials at the standard 15 mg/ml concentration. Widely used within the Spanish PIF Warriors community. No oral presentation available.
Pine
Injectable only6 ml injectable vials at 15 mg/ml. No oral presentation. The larger volume per vial compared with Lucky can mean opening new vials less often.
Brand comparison table
Example dose calculated for a 5 kg cat with dry FIP (8 mg/kg/day injectable).
| Feature | Lanzi | Lucky | Pine |
|---|---|---|---|
| Volume per vial | 8 ml | 5.2 ml | 6 ml |
| Concentration | 17 mg/ml | 15 mg/ml | 15 mg/ml |
| Oral presentation | Yes: 50 mg and 80 mg | No | No |
| Dose for a 5 kg cat (dry FIP) | 2.35 ml/day | 2.67 ml/day | 2.67 ml/day |
| Indicative price | Ask | Ask | Ask |
Doses vary with the form of FIP and the weight of the cat. Use the dose calculator to work out the exact daily amount for your case.
Things to weigh when choosing a brand
The different brands offer varying concentrations and presentations. The choice depends on the form of FIP, the weight of the cat, how easy it is to administer, and what is available at the time of treatment.
- The choice of brand should always be supervised by a vet experienced in FIP.
- Treatment must be followed for the full recommended period, usually 12 weeks, without interruptions.
- Getting the dose right for the weight of the cat and the form of FIP matters.
- Brand availability can vary by moment and region.
- The route of administration, injectable or capsules, can be the deciding factor for some owners.
The success of the treatment depends largely on consistency and on giving the medication correctly throughout the whole period.
How to judge the quality of a brand
PIF Warriors has developed informal criteria for judging how reliable an antiviral brand is:
- Concentration verified by independent laboratory analysis
- Transparency about active ingredients and excipients
- Reputation and track record within PIF Warriors
- Availability of quality control testing
- Batch-to-batch consistency reported by users
- Customer service and responsiveness
Need guidance on the brands?
Not sure which brand might suit your case best? Tell us your cat's situation and we will help you find the information you need.