Cyclosporine for Dogs and Cats: Uses, Dosage and Side Effects

Veterinarians may prescribe Cyclosporine for dogs and cats to manage:

• Atopic dermatitis (chronic allergic skin disease)
• Immune-mediated skin disorders
• Chronic inflammatory skin conditions
• Allergic dermatitis that does not respond to antihistamines alone
• Perianal fistulas and dry eyes in dogs
• Certain immune-mediated eye conditions (e.g., keratoconjunctivitis sicca, as topical formulations)
• Inflammatory bowel disease
• Immune-mediated diseases where steroid-sparing therapy is desired

Cyclosporine is not used to treat:

• Bacterial, parasitic, or fungal infections on their own
• Acute allergic emergencies (e.g., anaphylaxis)
• Conditions where immune suppression would be unsafe

In simple terms:

• The immune system uses special cells (T-cells) to trigger inflammation and allergic reactions
• Cyclosporine reduces the activity of these cells
• This lowers the release of inflammatory signals that cause itching, redness, and tissue damage

As a result:

• Itching and skin inflammation gradually decrease
• Dogs scratch less, allowing the skin to heal
• Chronic allergic flare-ups become easier to control

In cats:

• It reduces immune-driven inflammation in the skin or gut
• It helps control chronic allergic or inflammatory conditions
• It allows reduced reliance on corticosteroids in some cases

Cyclosporine for dogs must be given exactly as prescribed. Dosing is individualised and depends on:

• Body weight
• Severity of disease
• Whether the condition is acute or chronic
• Response to treatment
• Concurrent medications

General administration principles:

• Usually given orally once daily at the start of therapy
• Long-term therapy may involve dose reduction or alternate-day dosing once control is achieved

Pet parents should never:

• Stop Cyclosporine suddenly without veterinary advice
• Adjust the dose based on visible improvement alone
• Substitute human formulations without approval

Puppies have developing immune systems veterinarians may:

• Avoid routine use unless clearly necessary
• Use lower or carefully adjusted doses
• Monitor growth, appetite, and infection risk closely

Small dogs are more prone to dosing errors and gastrointestinal sensitivity key considerations:

• Accurate weight measurement
• Monitoring for vomiting or diarrhoea
• Gradual adjustment of dose if side effects occur

Medium-sized dogs often tolerate Cyclosporine predictably. Response is usually assessed over several weeks before determining long-term dosing.

Large dogs may require higher total doses based on body weight. But dosing remains strictly weight-based, not size-based. Long-term use may require periodic health checks.

Cyclosporine for cats is commonly prescribed in a liquid form important points:

• Give exactly as directed
• Administer slowly to reduce stress and vomiting
• Absorption is generally similar whether Cyclosporine is given with or without food.
• Monitor appetite, stool quality, and behaviour closely

Kittens are particularly vulnerable to immune suppression. Veterinarians generally:

• Avoid Cyclosporine unless necessary
• Use conservative dosing
• Monitor closely for infections and poor weight gain

Side effects are possible, especially early in treatment.

Common side effects include:

• Vomiting
• Diarrhoea
• Reduced appetite
• Soft stools

Less common but essential:

• Overgrowth of gum tissue (gingival hyperplasia)
• Increased susceptibility to infections
• Changes in hair coat
• Weight loss with long-term use
• Heavy callusing on the footpads
• Swollen or red ear flaps

Cats may experience:

• Vomiting (most common)
• Diarrhoea
• Reduced appetite
• Lethargy

Overdose may result in:

• Severe gastrointestinal upset
• Lethargy
• Increased risk of infection

Cats exposed to excessive doses may show:

• Marked vomiting
• Loss of appetite
• Weakness

• Store at room temperature
• Protect from light and moisture
• Keep liquid formulations tightly closed
• Do not refrigerate unless instructed
• Keep out of reach of pets and children
• Do not use expired medication

Contact your veterinarian if your pet shows these signs of emergency:

• Persistent vomiting or diarrhoea
• Loss of appetite lasting more than 24 hours
• Signs of infection (elevated body temperature, discharge, sores)
• Sudden behavioural changes
• Worsening skin or gut symptoms