Veko CaThyro 5mg is a prescription-only veterinary antithyroid medication formulated for the targeted management of feline hyperthyroidism (overactive thyroid gland). The active pharmaceutical ingredient, Methimazole (5mg), acts as a potent antithyroid agent that works by inhibiting the thyroid peroxidase enzyme. This direct action blocks the iodination of tyrosine residues in thyroglobulin, effectively halting the synthesis of the critical thyroid hormones thyroxine (T4) and triiodothyronine (T3).

Hyperthyroidism is one of the most common endocrine disorders in senior cats, typically caused by benign thyroid adenomas that flood the bloodstream with excess metabolic hormones. Left untreated, it leads to severe systemic strain, including thyrotoxic cardiomyopathy (heart muscle disease), secondary hypertension (high blood pressure), and progressive weight loss despite a ravenous appetite. By stabilizing hormone production, CaThyro 5mg successfully reverses clinical signs like hyperactive behavior, unprovoked vocalization, chronic vomiting, diarrhea, and a poor, unkempt coat. Administered orally as per a veterinarian's strict titration schedule, it safely restores metabolic equilibrium, protects vital organ systems, and significantly extends the life expectancy and comfort of senior felines.