ROHTO Cool 40α 12ml

100% Genuine (Adilsons sourcing policy) · Made in Japan · General OTC Ophthalmic Drug (Japan's lowest-risk, self-selection OTC tier, per Japanese retail listings — not independently verified against a government registry) · Not a cosmetic, so no INCI/vegan/halal/FA-safe badges apply the way they would to a serum.

Pros: immediate, strong cooling relief; combines an antihistamine, a focus-fatigue agent, and nourishing co-factors in one bottle; small and travel-friendly. Caveats: the cooling intensity is genuinely startling on first use; contains BAK, so it needs a 15-minute buffer around soft contact lenses; it treats symptoms, not underlying eye conditions.

• When: Any time your eyes feel tired, dry, dusty, or itchy — AM, PM, or mid-day, as needed.
• How much: 1-2 drops per eye, up to 5-6 times per day.
• How: Tilt your head back, pull down the lower lid to form a small pocket, release the drop without touching the dropper to your eye or lashes, then close your eyes gently for about 30 seconds.

If this is your first time using it: expect an intense, almost startling cooling sensation for a few seconds. That is the menthol, d-borneol, and eucalyptus oil doing exactly what they are formulated to do — it is not a sign of a reaction unless it turns into real pain or does not fade within a minute or two.

• Before you start: Wash your hands. If you wear soft contact lenses, remove them and wait roughly 15 minutes after applying before reinserting — this product contains Benzalkonium Chloride (BAK), which can accumulate in lens material.
• Technique: Tilt your head back and look up. Gently pull your lower eyelid down to create a small pocket. Hold the dropper close to the eye without letting it touch your eye, lashes, or fingers, and release 1-2 drops into the pocket.
• After: Close your eyes gently for about 30 seconds — do not blink rapidly or squeeze your eyes shut, which can push the drop back out before it spreads. Wipe away any excess with a clean tissue and recap the bottle tightly.
• Frequency: Up to 5-6 times per day. If you find yourself needing it more often than that to feel comfortable, that is a signal to see an eye doctor rather than to increase use.
• Other eye drops or medication: If you use other prescription or lubricating eye drops, space this product roughly 5-10 minutes apart from them so one drop does not wash out the other, and check with a pharmacist if you are on prescription eye medication.

Normal sting vs. a real reaction: Sting that peaks in the first 10-30 seconds and fades is expected. Pain that does not fade, spreads, or comes with swelling, discharge, or blurred vision that does not clear is not normal — stop use and see a doctor.

This is a symptom-reliever, not a treatment: it does not diagnose or treat an underlying eye disease. If you need drops daily just to get through the day, that pattern itself is worth mentioning to an eye doctor.

• Eye fatigue/strain from screens or reading — Neostigmine Methylsulfate is included to ease the focusing (accommodation) muscle fatigue behind that "can't focus anymore" feeling.
• Minor itching from pollen or dust — Chlorpheniramine Maleate is a genuine antihistamine at a low OTC dose.
• Dryness sensation and minor irritation from AC, wind, or dust — the aqueous base plus Sodium Chondroitin Sulfate is marketed to add lubricating cushion to the eye surface.
• General "tired eye" sensation — Vitamin E, Vitamin B6, and L-Potassium Aspartate are the brand's "nourishing" trio, marketed for ocular metabolism support.

What this product cannot do: it cannot treat conjunctivitis, styes, corneal abrasions, chronic dry eye disease, or any infection — those need an eye doctor. It also does not contain a redness-specific vasoconstrictor, so if persistent bloodshot eyes (not just tired ones) are your main concern, this formula was not built primarily for that.

• Contact lenses: Remove soft lenses before use because of the BAK preservative, and wait about 15 minutes before reinserting. Always check your own box for lens-specific wording, since formulations and instructions can vary by market batch.
• Other eye drops: Space at least 5-10 minutes apart from a different eye drop so neither is diluted or washed out; check with a pharmacist if combining with a prescription eye medication.
• Makeup and eye-area skincare: Apply this before eye cream or makeup, and give it a minute or two to settle first.
• In-catalog eye-area skincare: Adilsons carries topical eye-area creams and serums (for the skin around the eye, such as dark circles or fine lines) — these are applied to skin, never inside the eye, so they do not interact with this product biologically; they simply address a different, external concern in the same area.

Active ingredients (cross-referenced across English-language multi-retailer listings and Japanese-language pharmacy retail pages; not confirmed against an official package-insert photo, since the retailer pages that would show one were unreachable during this research):

Inactive ingredients/excipients: Boric Acid, Borax, l-Menthol, d-Borneol, Eucalyptus Oil, Chlorobutanol, Benzalkonium Chloride, Sodium Edetate, Polyoxyethylene Hydrogenated Castor Oil, pH adjusters.

Correction note: an earlier version of this listing named Tetrahydrozoline Hydrochloride (a vasoconstrictor) and d-Camphor among this product's ingredients. Our research this round could not corroborate either — two independent sources agree on the list above, with d-Borneol (not d-Camphor) and no tetrahydrozoline, which our Japanese-language source associates with a different Rohto product instead. We have corrected this here rather than repeat the earlier claim.

Animal-derived ingredient note: Sodium Chondroitin Sulfate is, across the industry, most commonly sourced from animal cartilage (shark, bovine, or porcine). The exact source used in this formulation was not disclosed anywhere we could check, so we cannot responsibly state a vegan or Halal status for this product either way — see Sec 26 below.

• Scent/sensation profile: Strong, minty-herbal, from Menthol, d-Borneol, and Eucalyptus Oil — this is not a "fragrance" in the cosmetic sense, but it is a deliberately intense sensory agent and should not be described as fragrance-free.
• Intensity: High on first contact, fading within roughly 30-60 seconds for most users.
• Preservative irritation risk: Benzalkonium Chloride and Chlorobutanol are both known, in some users, to cause dryness or irritation with frequent long-term use, particularly for soft contact lens wearers.
• Known sensitivities: If you have a known sensitivity to menthol, eucalyptus, or antihistamines, discuss this product with a pharmacist before use — patch testing (as used for skincare) is not applicable to eye drops.

Halal status: not asserted. Rohto does not market this product with a Halal claim, and Sodium Chondroitin Sulfate — a listed active — is commonly animal-cartilage-derived (shark, bovine, or porcine) across the industry with the specific species undisclosed here. We are not comfortable self-assessing this as Halal-friendly without knowing that source, so we are stating this plainly rather than guessing.

Vegan status: not asserted, for the same reason — Sodium Chondroitin Sulfate's animal origin is common industry-wide and unconfirmed for this specific SKU.

Cruelty-free status: not researched this round. No brand-wide cruelty-free claim or third-party certification was verified for Rohto during this session.

Microplastic-Free: Yes — no microplastic-forming polymers were found in the ingredient list checked.

Japanese retail listings classify this product as a Class 3 OTC drug (第3類医薬品) — Japan's lowest self-selection risk tier for over-the-counter medicines, not requiring pharmacist consultation at the point of sale in Japan. This was not independently cross-checked against a Japanese government drug registry this round, so treat it as retailer-reported rather than regulator-confirmed.

The individual actives (antihistamine, cholinesterase inhibitor, vitamins, amino acid) each have well-established, decades-old pharmacological mechanisms for their stated OTC uses. No product-specific clinical trial data for this exact formulation was found or is expected to be publicly published for this OTC category — claims rest on the known behavior of the individual ingredients, not a combined efficacy study.

Texture: Clear, water-thin aqueous solution. Sensation: Very high cooling intensity — among the stronger drops in Rohto's Cool lineup, driven by Menthol, d-Borneol, and Eucalyptus Oil together rather than menthol alone. pH: Not publicly disclosed for this specific SKU; ophthalmic solutions are generally formulated near natural tear pH as a category norm, but we did not find a verified figure for this product.

• Storage: Room temperature, away from direct sunlight and heat — avoid leaving the bottle in a hot car or on a sunny windowsill in Mauritius' climate. Do not freeze.
• After opening: Most multi-dose ophthalmic drops of this type are intended to be discarded within about 1 month of first opening regardless of remaining volume, because the preservative system's ability to control contamination weakens over time and with repeated dropper exposure to air and fingers — check your own box for its printed discard window rather than relying on this general figure.
• Spoilage signs: Discard if the solution changes color, becomes cloudy, or if the dropper tip has touched any surface (including your eye, skin, or fingers) — contamination risk is not worth the remaining product.

Patch testing does not apply to eye drops the way it does to skincare — instead, the safety protocol here is about hygiene and dosage discipline. Never let the dropper tip touch your eye, eyelashes, fingers, or any surface; doing so can introduce bacteria into the bottle and put every future drop at risk of eye infection. Keep the cap on tightly between uses and never share the bottle with anyone else.

Do not exceed 5-6 uses per day. Needing it more often than that, or needing it every day for more than a few days running, is a signal to see an eye doctor rather than a reason to use more.

Stop immediately and seek medical care if you experience: eye pain, sudden vision changes, swelling, discharge, or symptoms that do not improve (or that worsen) within 72 hours.

• Using it more than 5-6 times a day hoping for faster relief — this does not speed anything up and increases irritation risk from the preservative system.
• Letting the dropper tip touch the eye or fingers — this is the single most common way eye drops get contaminated.
• Wearing soft contact lenses through application without removing them first.
• Continuing daily use for weeks without seeing a doctor when the underlying tiredness or dryness never actually improves — that pattern deserves a proper eye exam, not more drops.
• Storing the bottle somewhere hot (car dashboard, sunny windowsill) in Mauritius' climate, which can degrade the formula faster than the printed expiry assumes.

A 12ml bottle holds roughly 240-300 drops. At a light use pattern (2 drops total, 3 times a day = 6 drops/day) that is roughly 40-50 days; at a heavier pattern within the daily maximum (4 drops total, 5 times a day = 20 drops/day) that is roughly 12-15 days. Whichever pace you use it at, remember the roughly 1-month-after-opening discard guidance above often arrives before the bottle is empty at lighter use rates — buying a smaller-use-cadence habit in mind can reduce waste.

Adilsons does not currently carry a dedicated preservative-free artificial tears product, a lubricating eye drop, or another Rohto eye-drop variant to pair alongside this one — this category is under sourcing review. Verified via a live catalog search on 2026-09-09: the only Eye Drops-type product currently listed is this one, and the only other ROHTO-brand items in stock are Melano CC skincare (essence, face wash, brightening gel/cream), which are topical facial products, not eye drops.

If you also want to care for the visible skin around your eyes (dark circles, puffiness, fine lines) as a separate, external concern, Adilsons does carry dedicated eye-area creams — but these are applied to skin, never used inside the eye, so treat them as a different routine entirely rather than a "pairing" for this product. Verified in stock on 2026-09-09: Beauty of Joseon Revive Eye Serum, SKIN1004 Probio-Cica Bakuchiol Eye Cream, MARY&MAY Tranexamic Acid + Glutathione Eye Cream, and heimish Bulgarian Rose Hydrogel Eye Patch.

The recommendation above reflects what is actually in stock as of this writing, not margin or promotion — if nothing fits, we say so.

We checked the live catalog for a milder-cooling or preservative-free alternative eye drop to offer here and found none — Adilsons does not currently carry a dedicated alternative eye drop formula (Rohto's own gentler "Aqua"-style variants or a plain lubricating tears product); this category is under sourcing review.

• If you need daily lubrication for chronic dryness rather than an occasional cooling refresh, a preservative-free artificial tears product (not currently stocked here) is generally the better-suited category.
• If you dislike intense cooling, this specific formula will likely be too strong — Rohto's own "Aqua" line is reported (via general product research, not first-hand verification) to be gentler, but is not currently in this catalog.
• If you already have any unopened or lightly-used eye drops at home, finish those first — see the No-Buy check below.

This product's primary function is temporary symptomatic relief of tired, itchy, or mildly dry/irritated eyes via an intense cooling sensation. You likely do not need this if you already own any general-purpose cooling or refreshing eye drop with a similar active profile — finish that bottle first, especially since most opened eye drops should be discarded roughly a month after opening regardless of remaining volume, so buying a second bottle while one is already open is usually waste, not backup stock.

If your actual issue is chronic dryness rather than occasional tiredness, or diagnosed allergic conjunctivitis rather than mild dust/pollen itching, a differently-formulated product (or a doctor's visit) may serve you better than stacking two similar cooling drops.

Rohto is a Japanese brand, not a Korean one — this product is sourced by Adilsons through authorized importers/distributors bringing genuine Rohto stock into Mauritius, rather than through the Korean-distributor channel (Craver Co., Ltd) that supplies most of our K-beauty catalog. Adilsons guarantees this product is 100% genuine.

For comprehensive information about how we verify authenticity, our layered verification system, and how to check your product at home, visit our dedicated Authenticity and Trust page.

Quick verification tips: genuine bottles carry Japanese-language text on the box (ロートクール40α), a printed batch code and expiry date, and an intact seal on the cap. If anything about your bottle looks inconsistent with these, contact us on WhatsApp with photos for a check.

Rohto Pharmaceutical Co., Ltd. is a Japanese OTC pharmaceutical and cosmetics company founded in 1899 and headquartered in Osaka. It is best known internationally for its eye drop lines (including this Cool series) and for skincare brands such as Hada Labo, Skin Aqua, and Melano CC. The company has long positioned its eye care line around modern digital eye strain, alongside its long-running pharmaceutical heritage.

OTC

Over-the-counter — available without a doctor's prescription.

Antihistamine

An ingredient (here, Chlorpheniramine Maleate) that blocks histamine's action, easing minor itching from allergens like pollen.

Cholinesterase inhibitor

A drug class (here, Neostigmine Methylsulfate) that affects nerve-muscle signaling; in this product it is used at a low dose to ease eye-focusing muscle fatigue.

BAK (Benzalkonium Chloride)

A common eye-drop preservative that can build up in soft contact lens material over repeated exposure.

Accommodation

The eye's ability to shift focus between near and far objects — the muscle process that gets fatigued by hours of screen use.

Vasoconstrictor

An ingredient that narrows blood vessels to reduce visible redness. This product does not contain one.

Can I use this with contact lenses? Remove soft lenses first and wait about 15 minutes before reinserting them, because of the BAK preservative. Check your own box for any lens-specific wording.

Why does it sting so much? The combination of Menthol, d-Borneol, and Eucalyptus Oil is formulated to be intensely cooling — that is the product working as designed, not a reaction, as long as it fades within roughly a minute.

Does this reduce redness? It is not built around a redness-specific vasoconstrictor the way some eye drops are — its main jobs are focus-fatigue relief, minor itching relief, and a cooling, refreshed feeling. If persistent bloodshot eyes are your main concern, this may not be the most targeted formula.

Can children use this? This is generally an adult-use product; consult a doctor or pharmacist before giving it to a child.

Is it safe to use every day, long-term? For occasional refreshing within the 5-6-times-a-day limit, that is the intended use; but needing it daily for weeks on end without improvement is worth mentioning to an eye doctor rather than just continuing.

Every product sold by Adilsons Beauty is 100% genuine, sourced through authorized distribution channels. Full details on our verification system: Authenticity and Trust.

Our team is available to help you build a routine, troubleshoot reactions, and answer ingredient questions. WhatsApp: +230 5 778 2336.

For in-depth skincare education, visit our blog at adilsons.mu/blogs/k-beauty or subscribe to our email to get our guided education series delivered to your inbox.

Coverage: Island-wide delivery (Mauritius).

Processing and Timing: Orders process in 1-2 business days; usually ready by Day 3 for pickup by our delivery partners/regional team. Partner collection can take up to 1 week. After pickup, delivery typically takes 1-5 business days (weekdays only).

Express: May be available by region; request on WhatsApp: +230 5 778 2336.

Liquids/Sensitive Items: Serums, toners, liquid makeup (and kits containing liquids) are pickup or door-to-door only; checkout enforces this.

Scheduling: Deliveries run by region on set schedules; we will contact you the evening before.

Pickup: Citadelle Mall pickup available.

Returns: No change-of-mind exchanges.

Refunds (Summary): For defective/damaged on receipt (report within 48h), wrong item, or manufacturing defect within 6 months. Refunds via bank transfer (7-10 business days); card refunds may incur a 5% processor fee (fee not charged for defects/order errors). Opened skincare/personal-care items are non-returnable (except if damaged on delivery).

Source of Truth: This is a quick snapshot. If anything differs, the policy pages are final.

Store Policies: For the most up-to-date information, please review our Shipping Policy and Refund Policy.

Best for: Adults who want fast, intense cooling relief for screen-tired, dusty, or mildly itchy eyes and don't mind a strong menthol sensation.

Key benefits: immediate cooling refresh; a genuine antihistamine for minor itching; a focus-fatigue agent aimed at digital eye strain; small, travel-friendly 12ml bottle.

Keep in mind: the cooling is genuinely intense and not for everyone; it contains BAK, so soft contact lens wearers need a removal buffer; it does not contain a redness-specific vasoconstrictor, so it is not the right pick if bloodshot eyes (not just fatigue) are your main concern; and it treats symptoms only, not underlying eye conditions.