Every vial contains ≥10 ml of injectable GS-441524 solution.

Injections can cause discomfort due to the acidity of the solution (pH ~1.5–1.6), which is necessary to keep GS-441524 dissolved. Pain varies by cat and by injection technique. Rotating injection sites, injecting slowly, and using a fine-gauge needle all reduce discomfort. Some owners use gabapentin before injections — ask your vet if this is appropriate for your cat.

Sores develop when the same site is used repeatedly or the injection goes too deep into muscle or nerve tissue. Rotate sites and always inject into the subcutaneous layer (under the skin, not into muscle). If a sore develops, clear surrounding hair and clean gently 4+ times daily with a 1:5 dilution of hydrogen peroxide. Contact our team if sores worsen or do not heal within a few days.

Struggling during injections is common. Try wrapping your cat in a towel (the 'burrito' method) to restrict movement. Administering just before a favourite meal can help associate injections with a positive experience. If your cat remains highly resistant, ask your vet about short-term gabapentin before injections. Injecting quickly and confidently also reduces overall stress for both cat and owner.

Lift a fold of skin with your thumb and forefinger before inserting the needle at a 45-degree angle into the raised skin tent. If you have lifted enough skin you will be in the subcutaneous layer. You should feel minimal resistance when pushing the plunger. If your cat vocalises sharply or the area hardens immediately after injection, the needle may have gone too deep. Watch our instructional video for a step-by-step demonstration.