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Calcium chloride (Calchlorin®, CaClCa) can be used as a non-surgical castration technique in male cats and dogs but is not currently being used for this purpose in Australia. The chemical was first investigated as a method of sterilisation in the 1970s, with recent field and experimental trials conducted in the past decade in India, Italy and the US. Calcium chloride has been used overseas in some low-cost spay and desexing programs focussing on mass population control and the reduction of unowned animal populations1. The benefits of chemical castration are its relatively low cost and that it does not require surgery or general anaesthesia. This is useful in countries with limited access to sterile operating theatres, potentially allowing many more animals to be castrated than under surgical desexing programs. However, surgical desexing performed by a veterinarian under sterile surgical conditions and with the animal anaesthetised is considered the gold standard of care2. This is because surgical desexing has low post-operative complications, sterilisation is permanent, and it has the flexibility to be used for all types of dogs and cats3.
How does calcium chloride desex male dogs and cats?
When used as a chemical castration agent, calcium chloride is injected directly into both testes whilst under sedation. The chemical is injected until each teste feels ‘full’. This injection causes the testes to atrophy (waste away) resulting in sterility and a decrease in testosterone production4. One study has shown that calcium chloride combined with ethyl alcohol successfully sterilised male dogs for 12 months, however studies have not been performed beyond this time1.
What are the limitations of calcium chloride as a castration method?
The RSPCA supports further research and investigation into alternatives to surgical desexing methods including immunological and chemical sterilisation as well as legislative reform to recognise alternatives to surgical desexing. Due to the experimental nature and potential risks of calcium chloride6 as a method for non-surgical desexing, surgical castration remains the method of choice for companion animals in RSPCA shelters.