Antiseptics Which Are Safe And Toxic For Cats

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(Last Updated On: November 12, 2018)

Overview   Toxic antiseptics   Safe antiseptics   Cat wound treatment   When to see a veterinarian

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Overview:

Antiseptics are antimicrobial substances which kill or inhibit the growth of bacteria and are used to prevent or treat wounds. They may be germicides or bactericidal:

  • Germicides destroy pathogenic organisms (bacteria, viruses, fungi, protozoa etc)
  • Bacteriocide destroys bacteria

It is easy to assume that anything that is safe to use on humans is safe to use on cats, but this is not true. Cats lack the necessary liver enzymes to break down many products which are safe to use in humans. They are also at an increased risk of toxicity due to ingesting anything which comes into contact with their coat when they groom. 

Antiseptics safe to use on cats

Products containing either chlorhexidine diacetate or iodine as well as salt water (saline) are safe for cats.

Product

Instructions

Chlorhexidine (Peridex, ChlorhexiDerm, Avaguard) Comes in 1% or 2% strength. Dilute 2% at a ratio of 2 tablespoons per 1 gallon of water. Do not use chlorhexidine inside the ears as it is ototoxic.
Iodine (Betadine) Dilute to the colour of weak tea.
Salt water (saline) Mix 1 tablespoon salt in 1 cup (250 ml/8.5 oz) warm water.

Avoid contact with the eyes when using antiseptics, these are for external use only.

Antiseptics to avoid:

Antiseptics come in a number of groups, and all of these groups should be avoided:

Product/type

Alcohol Either methyl or isopropyl. Brands include Isocol. 
Phenols Substances which turn white in water. Brands include Dettol and TCP.
Peroxigen The most common type of perixigen antiseptic is hydrogen peroxide.
Quaternary ammonium Brands include Savlon.
Essential oils Many of which, including tea tree and lavender are toxic to cats.
Neosporin Contains Polymyxin B which has been known to cause anaphylaxis in cats.

 

How are antiseptics dangerous to cats?

  • Toxicity by ingestion of an antiseptic on the coat.
  • Ulcers and burns on the tongue when licking antiseptics.
  • Damage to the tissue.
  • Embolism (hydrogen peroxide).
  • Anaphylactic shock (Neosporin).

Why are these antiseptics dangerous to cats?

Peroxigen (hydrogen peroxide)

Causes: Damage to tissues and embolism

Hydrogen peroxide is made up of two hydrogen atoms and two oxygen atoms (H2O2). When it comes into contact with an open wound it is known to produce bubbles. This occurs because blood and other living cells contain an enzyme called catalase, when hydrogen peroxide comes into contact with catalase it converts hydrogen peroxide into water (H2O) and oxygen gas (O) producing the charcteristic bubbles. Not only are bacteria damaged during this process but healthy tissue is damaged also.

When applied to deep cuts, hydrogen peroxide can cause an embolism (blockage of an artery) when the oxygen produced by the decomposition of hydrogen peroxide enters a nearby blood vessel.

Essential oils

Causes: Toxic

Essential oils are concentrated compounds obtained from plants. Many of which are highly toxic to cats if inhaled, applied to the skin or ingested.

Tea tree oil

Causes: Damage to tissues and toxicity

Also known as melaleuca, tea tree oil is a popular antiseptic with antibacterial and antifungal properties.   There are a number of toxic components in tea tree oil including linalool, ocimene, alpha-terpinene, 1,8-cineole, terpinolene, camphene. 1,8 cineole is reported to be the major contributor to adverse reactions.

Some reports say that it is safe at a dilution of 0.1 to 1%, but can only be used on parts of the cat he is unable to lick. Even then, I wouldn’t risk it when there are safer alternatives.

Phenols

Causes: Damage to tissues and toxicity

These coal-tar derivatives are common in antiseptics, disinfectants, and household cleaners. They turn white when water is added. Common products include Dettol, TCP, Lysol, and Pine-o-Clean. Phenols are extremely toxic to cats, who are less efficient at excreting these chemicals.

These products are corrosive to the skin and mucus membranes, resulting in cell necrosis. Accumulation of phenols in the body, through the skin or via the skin causes liver and kidney damage.

Alcohol

Causes: Damage to tissues

The application can cause burning and inflammation and damage to the cells can slow down the healing process.

Quaternary ammonium

Causes: Chemical burns and ulceration

Quaternary ammoniums cause chemical burns and esophageal ulceration if ingested.

Neosporin

Causes: Potentially toxic/anaphylactic

A popular antibiotic cream which contains neomycin, polymyxin B, and bacitracin.  It is not labelled for use on cats. Anaphylaxis has occurred in some cats who have received treatments containing polymyxin B.

Cat wound treatment

What you will need: 

  • Sterile gauze of sanitary towel (to stop bleeding)
  • Sterile gauze (to clean the wound)
  • Syringe (without needle)
  • Antiseptic
  • Salt
  • Water
  • Scissors
  • Soap and water

Saline solution:

  • 1 cup (250 ml) water
  • .5 (half) teaspoon salt
  • Mix well

Instructions: 

  1. Thoroughly wash hands with soap and water and dry.
  2. If the wound is bleeding, use clean gauze or a sanitary towel and apply gentle pressure to the wound. It can take up to 10 minutes for bleeding to stop.
  3. Flush (irrigate) the wound using a syringe filled with saline solution to remove debris.   If necessary, trim the fur around the wound. If you don’t have a syringe, a use clean gauze or a soft cloth. Always flush or wipe debris towards the outside of the wound.
  4. Once bleeding has stopped and the wound has been flushed, apply the antiseptic solution to a clean gauze strip, squeeze to remove excess liquid and clean the wound. I recommend a solution over ointments and creams, which are easier to lick off and ingest.
  5. Continue to clean a 1-inch margin around the wound.
  6. Gently pat the wound and surrounding area with a clean gauze.

When to see a veterinarian

Always see a veterinarian if the following occurs:

  • Puncture wounds or long, deep wounds.
  • Wounds which are longer than 1 inch (2.5 cm) or with jagged edges.
  • Heavy bleeding.
  • Burns.
  • Animal bites.
  • Wounds caused by an animal bite.
  • If redness, discharge or inflammation develop.
  • Fever.
  • Pain.
  • Any minor wounds which aren’t showing signs of healing within 24 hours.

5 COMMENTS

  1. Thank you. Very thorough and helpful advice for wounds in cats and what antiseptics to use and which to not use.

    • I would speak to your veterinarian. I had to apply some Betadine to a wound on my knee yesterday and noticed that it said ‘for external use only’. So personally wouldn’t apply it to the gums unless a vet has given it the okay.

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