Griseofulvin Paste

Paste medications are thick and sticky, usually given by mouth using a syringe or tube. They’re often used for dewormers or other oral meds in horses, dogs, and cats. The key is to aim for the back of the mouth so your pet swallows the paste instead of spitting it out.

For Horses:

1. Set the dose on the syringe if it has markings (usually based on weight).
2. Stand beside your horse, not in front, and have someone hold them if possible.
3. Gently insert your thumb into the side of the horse’s mouth (between the teeth) to open it.
4. Insert the syringe into that gap and squirt the paste toward the back of the tongue.
5. Lift the horse’s head slightly and encourage swallowing by stroking the throat or gently blowing on the nostrils.
6. Watch for licking or chewing—that means they swallowed. If paste spills out, check how much was lost and contact your vet if unsure.
7. You can offer a little water afterward and reward them with a treat like a carrot if allowed.

For Dogs & Cats:

1. Gently open your pet’s mouth or slip the syringe into the side of it.
2. Aim toward the back of the tongue and squirt the paste in.
3. Hold the mouth closed briefly, and rub the throat or blow gently on the nose to encourage swallowing.
4. Give praise or a treat afterward to make it a positive experience.

Aftercare:

1. Wipe your pet’s mouth if needed.
2. Clean or recap the syringe as instructed.
3. Store the tube according to label directions.

Tip: Paste can feel weird to pets at first. For horses, try giving applesauce by syringe ahead of time so they get used to the sensation.

The uses and pharmacology described below reflect the FDA-approved labeling for this active ingredient; your veterinarian determines whether and how they apply to your animal's treatment plan.

Veterinarians most commonly consider griseofulvin when a patient is presented with clinical signs of dermatophytosis, more commonly known as ringworm. It is frequently a point of discussion for managing infections caused by Microsporum or Trichophyton species that affect the skin, hair and claws. By targeting the cellular structure of the fungi, your veterinarian can manage the progression of the infection within the keratinized tissues of the body.At a pharmacological level, griseofulvin acts as a fungistatic agent by disrupting the fungal cell's mitotic spindle structure. It binds to the tubulin proteins necessary for the formation of microtubules, which arrests the process of cell division (metaphase). A unique characteristic of griseofulvin is its affinity for keratin; following administration, the medication is deposited in the precursor cells of the skin, hair and nails. As these tissues grow and differentiate, they carry the medication with them, creating a physiological barrier that is resistant to further fungal invasion. Because of this mechanism, the duration of use is often linked to the time required for healthy, uninfected tissue to completely replace the old. Your veterinarian will determine whether griseofulvin is appropriate based on your pet’s species, weight and the results of diagnostic testing.

Prescription only. Use only under the direction of a licensed veterinarian. This information is not a substitute for veterinary diagnosis, prescribing or monitoring. Compounded drugs are not approved by the FDA for safety or effectiveness.

Commonly observed effects of griseofulvin administration include gastrointestinal changes such as vomiting, diarrhea or a temporary decrease in appetite. In feline patients, a significant clinical consideration is the risk of bone marrow suppression, which can lead to decreased levels of white blood cells or platelets. Because of this, your veterinarian will monitor for signs of hematological health shifts, often through regular blood work. In some animals, owners may observe localized skin irritation or a heightened sensitivity to sunlight (photosensitivity) shortly after the medication is administered. If you observe significant lethargy, fever or signs of an allergic reaction such as hives, contact your veterinarian promptly.This medication is typically used with caution or avoided in patients with known liver impairment, as the liver is the primary site for the metabolic processing of griseofulvin. It is strictly avoided in pregnant animals because it is associated with significant teratogenic effects, meaning it can cause developmental abnormalities in the offspring. Before starting a protocol involving griseofulvin, ensure your veterinarian has a complete history of all other prescriptions and supplements your pet is receiving, as it may interact with anticoagulants or certain sedative agents. Your veterinarian is the right person to design a comprehensive monitoring plan and provide guidance on the necessary duration of use to ensure the management approach remains suitable for your pet's individual health status.