Description
Rohto Cool 40a is a Japanese over-the-counter eye drop formula containing 40 active ingredients — one of the most comprehensive compositions available in any single eye drop product. Manufactured by Rohto Pharmaceutical, a Japanese company with over 120 years of ophthalmic expertise, Rohto Cool 40a combines therapeutic actives with a signature cooling sensation to soothe tired, dry, red, or irritated eyes within seconds of application.
Key Benefits
- 40 active ingredients in one formula — addresses redness, itching, dryness, fatigue, and inflammation simultaneously, making it a complete eye care solution in a single bottle.
- Fast-acting cooling relief — the signature Rohto cooling sensation provides immediate invigoration, especially effective after screen use, late-night work, or exposure to dust and pollen.
- Taurine + Vitamin B6 — taurine supports corneal metabolism and cellular repair; Vitamin B6 (pyridoxine HCl) helps reduce eye muscle fatigue from prolonged focusing.
- Allantoin + Aminocaproic Acid — allantoin promotes healing of minor eye surface irritation; aminocaproic acid reduces inflammation.
- Tetrahydrozoline HCl (vasoconstrictor) — rapidly constricts dilated blood vessels, visibly reducing redness in seconds.
- Suitable for adults and children aged 7+ when used as directed. Available without a prescription.
Who Is This For?
Recommended for anyone experiencing dry, tired, or red eyes from prolonged screen time, air conditioning, driving, or seasonal allergens. Ideal if you want a single multi-action product that relieves multiple symptoms at once. Also popular among people who appreciate the distinct cooling sensation of authentic Japanese eye drops — noticeably stronger than most Western formulas.
How to Use
- Wash your hands before use.
- Tilt your head back and gently pull down the lower eyelid.
- Instil 1–2 drops into each eye.
- Blink slowly once or twice after application.
- Do not touch the tip of the bottle to your eye or any surface.
Frequency: 3–6 times daily as needed.
Tip: Store in the refrigerator for an enhanced cooling effect.
Cautions
- For external (eye) use only.
- Not recommended for use with soft contact lenses — remove lenses before applying, reinsert after 15–20 minutes.
- Discontinue use and consult a doctor if redness, pain, or blurred vision persists or worsens.
- Do not use if the solution changes colour or becomes cloudy.
- Keep out of reach of children. Store away from direct sunlight and heat.
Frequently Asked Questions
What does "40a" mean in Rohto Cool 40a?
The "40" refers to the number of active ingredients — an unusually high count for an OTC eye drop. The "a" designates the variant within the Cool sub-series. Rohto uses this naming to indicate multi-action formulas that address several eye concerns simultaneously.
Is Rohto Cool 40a safe for contact lens wearers?
Rohto Cool 40a is not recommended for use while wearing soft contact lenses, as some actives may be absorbed by the lens material. Remove your lenses before applying the drops and wait at least 15–20 minutes before reinserting them. For drops specifically designed for contact lens wear, consider Rohto Lycee Contact instead.
How is Rohto Cool 40a different from Rohto Vita 40a?
Both contain 40 active ingredients, but with different focus areas. Cool 40a emphasises fast cooling relief and redness reduction, with a stronger vasoconstrictor component. Vita 40a focuses more heavily on vitamin support — including Retinol (Vitamin A) and Neostigmine for eye muscle fatigue — making it better for long-term eye health maintenance. Cool 40a is ideal for immediate refreshment; Vita 40a for nutritional support.
Why do Japanese eye drops feel stronger than Western ones?
Japanese OTC eye drops are formulated with a higher concentration and wider range of active ingredients than most Western equivalents. Rohto also uses menthol derivatives and cooling agents (borneol, camphor) that create the characteristic intense cooling sensation. This is a deliberate design choice: Japanese consumers associate the strong cooling effect with efficacy and freshness.
Authentic product sourced and shipped directly from Japan. Processing time: 2–6 business days.