Itchy eyes are usually treated with Olopatadine drops for anti-allergic treatment, which are safer and have fewer side effects even after long-term use for 2-3 months. If you can’t buy Olopatadine drops, you can also try sodium cromoglycate or emetine drops, which can usually relieve the itchy eyes, but are still not as effective as Olopatadine. If none of these three medications can relieve itchy eyes, you should consider using hormonal eye drops, such as Flomipron eye drops or Demerol eye drops for anti-allergy treatment, which are often more effective and can usually relieve symptoms after 1-2 weeks. If the allergy is perennial, it may be relatively safe to switch to Olopatadine for maintenance afterwards.