Lysine

Lysine is a nutritional amino acid traditionally used in veterinary medicine with the intent of suppressing **Feline Herpesvirus-1 (FHV-1)** infections in cats. > **Clinical Controversy**: While historically popular, recent robust studies have cast significant doubt on its efficacy. Research indicates that lysine supplementation does not prevent or reduce the recurrence of upper respiratory tract infections in shelter cats. In some studies, cats receiving lysine actually showed an *increase* in disease severity and FHV-1 DNA detection. Consequently, many veterinary ophthalmologists and infectious disease experts no longer recommend its routine use.

กลไกการออกฤทธิ์: Lysine is an amino acid that acts as a competitive antagonist to **arginine** during viral replication. * **Mechanism**: Herpesviruses require arginine to synthesize viral proteins and produce infective viral particles. * **Pathway**: Lysine competes with arginine → Lysine is erroneously incorporated into the viral structure instead of arginine → The resulting viral particles are defective and less infective. *Note: The clinical failure of this mechanism in cats may be due to the feline's strict dietary requirement for arginine; artificially lowering arginine activity via lysine supplementation can have detrimental systemic effects.*

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