Japanese Eye Drops Guide: Rohto, Sante, Smile — How to Pick the Right One

"There are thirty kinds of eye drops in this Japanese drugstore — which one do I buy?"

"Can I use this one with my contacts in?"

"What's the Japanese equivalent of Visine?"

These are common questions at the pharmacy counter. Japanese eye drops are unusual on the global market for how finely they're segmented by cooling sensation and ingredient combination. This guide sorts them by symptom.

Quick Reference: What to Pick

1. The Three Major Manufacturers

The Japanese OTC eye drop market is dominated by Rohto, Santen, and Lion.

Rohto Pharmaceutical

The largest OTC eye-drop maker in Japan, known for the Rohto, V Rohto, and Sante lines. Their range covers everything from mild to extreme cooling.

• Rohto: classic line, mild to medium cooling
• V Rohto: stronger cooling, fatigue-focused
• Rohto C Cube: contact-lens specialty
• Rohto Digi Eye: targeted at PC and smartphone fatigue

Santen Pharmaceutical

A market leader in prescription ophthalmic drops, also strong in OTC under the Sante brand.

• Sante FX: among the strongest cooling sensations on the market
• Sante Medical series: high-spec, with vitamins and taurine
• Soft Santear: artificial-tear style, zero stimulation, contact-compatible

Lion

Best known for the Smile line — milder cooling, easy daily use.

• Smile 40: classic fatigue formula
• Smile Contact EX: contact-compatible

2. Picking by Symptom

Tired or Blurred Eyes

Long screen time, reading, or driving fatigue calls for vitamin-fortified drops.

Common active ingredients:

• Vitamin B12 (cyanocobalamin) — included as an ingredient that acts on ocular metabolism and nerves
• Taurine — included as a metabolism-related ingredient
• Neostigmine methylsulfate — supports focus adjustment function

The labeled indications differ by product, so check the package and insert for each item's actual approved indications.

Examples: Sante FX, V Rohto, Shin-V Rohto Gold

Dryness, Gritty Sensation

For dry eye from air conditioning, contacts, or aging, choose artificial tears.

• Sodium chloride / potassium chloride are formulated to reproduce some of the components of natural tears (not a complete replication of real tears)
• Zero cooling sensation, gentle on irritated eyes
• Some are safe to use with contacts in, but always check the per-product label

Examples: Soft Santear, Rohto Dry Aid EX, Smile The Medical A

Itchy Eyes (Allergy)

For pollen or dust allergies, use antihistamine-containing drops.

• Sodium cromoglicate — suppresses allergic-symptom onset
• Chlorpheniramine maleate — a first-generation antihistamine; may cause drowsiness or dry mouth in some users

Examples: Alguard, Rohto Alguard Clinical Shot, Sante AL

See also our Hay Fever Medicine in Japan guide.

Using with Contacts In

Look for "コンタクトレンズ装着時に使用できます" or "for use with contact lenses" on the package. Lens compatibility can vary between products in the same series, so always check the per-product package label.

• Examples of contact-compatible lines: Soft Santear, Rohto C Cube
• Soft-only / hard-only / both: confirm on the package
• Color contacts: avoid use unless explicitly stated as compatible

Some users report that strong-cooling drops feel uncomfortable while wearing contacts. This is more anecdotal than a well-documented effect, but if it concerns you, choose a no-cooling or mild-cooling product when contacts are in.

Redness Relief

For redness relief, look specifically for products that list a vasoconstrictor (naphazoline hydrochloride, tetrahydrozoline hydrochloride) in the ingredient panel. You cannot rely on series names alone — within the same line (Sante, Rohto, etc.), formulations vary product by product, so check the ingredient list every time.

Prolonged use can cause rebound redness that becomes worse than the original. Avoid continuous use beyond 1–2 weeks as a general rule.

3. The Cooling-Sensation Scale

Japanese eye drops are often labeled on a 0–8 cooling scale, but this is each manufacturer's own marketing convention, not a unified medical standard. A "3" from one brand may not feel like a "3" from another. Treat it as a within-brand reference only.

If you've never used Japanese eye drops before, start mild. Once you understand how the tingle feels, work upward only if you want to.

4. Class 2 vs. Class 3

OTC eye drops in Japan are split into Class 2 (containing antihistamines, antibacterial agents) and Class 3 (fatigue and artificial-tear formulas).

Important: Within the same brand line, individual products may be Class 2 or Class 3 (for example, certain Smile 40 derivatives are Class 2). Always confirm the class label on the actual package. See Types of Pharmacies in Japan for details.

5. Preservatives

Most eye drops contain preservatives such as benzalkonium chloride to prevent bacterial growth after opening.

• Healthy eyes generally tolerate them without issue.
• For severe dry eye or corneal damage, choose preservative-free products (Soft Santear, prescription drops) or consult a doctor.
• For continuous use while wearing soft contacts, preservatives may accumulate in the lens — pick a product that explicitly states contact-lens compatibility.

6. How to Apply Eye Drops Correctly

The proper steps, often skipped:

1. Wash your hands.
2. Tilt your head back and gently pull your lower eyelid down.
3. Without letting the bottle tip touch your lashes or eye, drop one drop.
4. Close your eyes gently for 1–2 minutes (lightly pressing the inner corner helps).
5. Blot any overflow with a tissue.

One drop per eye is enough. Extra drops just overflow without added effect.

If you're using multiple eye drops, wait at least 5 minutes between products.

7. Frequently Asked Questions

Q. What's the Japanese equivalent of Visine? A. Drops containing vasoconstrictor ingredients (naphazoline hydrochloride, tetrahydrozoline hydrochloride) are available in Japan as well. Check the ingredient list, or ask the pharmacist for a product "with a redness-reducing ingredient." That said, Japanese OTCs tend to bundle redness relief with anti-fatigue or vitamin formulas rather than selling pure single-purpose redness drops.

Q. What about Systane-style artificial tears? A. Soft Santear and Rohto Dry Aid EX are the closest. Many Japanese options are slightly more cooling than Systane, so if you want zero sensation, look for "artificial tears" / "preservative-free" / "fragrance-free" labeling.

Q. Can children use these eye drops? A. Pick products with explicit pediatric-use language (e.g., "for ages 7 and up"). Fatigue-formula Rohto / Sante are typically labeled for ages 7+; some artificial-tear formulas are usable from infancy. Don't guess — ask a pharmacist.

Q. How long after opening can I keep using a bottle? A. Roughly 1–3 months after opening, depending on the product. Check the label. Discard if discoloration or cloudiness appears, even before the date.

Q. Can I drop OTC eye drops on top of my contacts? A. Only with products explicitly labeled "for use with contacts." Otherwise, remove the lenses, drop, and reinsert after 5–15 minutes.

8. When to See an Eye Doctor

Stop self-treating and see an ophthalmologist if you have:

• Severe eye pain
• Vision loss or visual field changes
• A blow to the eye, or persistent foreign-body sensation
• Heavy yellow discharge (suggests bacterial conjunctivitis)
• No improvement after 3 days of OTC use
• Sudden worsening of redness or itch

Contact-lens users with eye pain or unusual discomfort are at risk of infectious keratitis — see an eye doctor rather than self-treating.

Sources

• Ministry of Health, Labour and Welfare (MHLW) — OTC drug risk classification
• Pharmaceuticals and Medical Devices Agency (PMDA) — package insert database
• Rohto Pharmaceutical — official product information
• Santen Pharmaceutical — official product information
• Lion Corporation — official product information
• Japan Ophthalmologists Association — proper eye-drop technique

Disclaimer: This article is for informational purposes only and does not constitute medical advice. For eye symptoms, please consult a licensed pharmacist or ophthalmologist.