- Onazin eye drops contains Tetrahydrozoline 0.05% which is used to whiten the eye and relieve minor eye irritations caused by; colds, hay fever, dust, smock, sun, wind and swimming. Onazin eye drops are used in the management of allergic conjunctivitis, non-specific conjunctivitis, mechanical and chemical irritation of the interior eye. It works by temporarily narrowing the blood vessels in the eye.Onazin Eye Drop 10Ml KShs550.00in ONAZINSku: O0045