Eye Drops: Types, Uses and How to Put Them In Correctly

Eye drops are among the most commonly used medicines in the world. Some are simple lubricants you can buy in any pharmacy; others are powerful prescription drugs that can save sight in glaucoma or, if misused, quietly damage it. Because the bottles often look alike, it is easy to assume that all eye drops are harmless. They are not.

This guide explains the main families of eye drops, what each is for, which ones should only be used under medical supervision, and the step-by-step technique that makes any drop work better. Good technique matters more than most people realise: a large share of each drop never reaches the eye surface, and poor hygiene can turn a bottle into a source of infection.

The main types of eye drops at a glance

Eye drops can be grouped by what they do. The table below gives an overview; each group is discussed in more detail afterwards.

Lubricating drops (artificial tears)

Artificial tears supplement or replace the natural tear film. They are the first step in managing dry eye disease and are useful for anyone whose eyes feel gritty after long screen sessions, flights or time in air-conditioned rooms. They do not treat the underlying cause, but they make the eye surface more comfortable and can protect it.

Drops, gels and ointments

• Thin drops (for example based on carboxymethylcellulose, hypromellose or hyaluronic acid) are comfortable and barely blur vision, so they suit daytime use.
• Gels are thicker, last longer and blur vision for a few minutes.
• Ointments last the longest but blur vision markedly, so they are usually reserved for night-time use.
• Lipid-containing drops aim to strengthen the oily layer of the tear film and may help people whose dryness comes from blepharitis or meibomian gland dysfunction.

Preservatives matter

Multi-dose bottles usually contain a preservative so that bacteria do not grow after opening. Benzalkonium chloride (BAK), the most common one, can damage the eye surface with frequent use. As a rule of thumb, if you need drops more than about four times a day, or you wear contact lenses, choose preservative-free products: single-dose vials or special multi-dose bottles with filters or valves. Our article on how to choose artificial tears explains the options in more detail.

Allergy drops: antihistamines and mast cell stabilisers

In eye allergies, itching is the hallmark symptom. Allergy drops work in several ways:

• Antihistamine drops block histamine and relieve itching within minutes.
• Mast cell stabilisers (such as sodium cromoglicate) prevent the release of histamine. They work best when started before the allergy season and may take several days to reach full effect.
• Dual-action drops combine both effects and are often the most convenient choice for seasonal allergy.

Keeping allergy drops in the refrigerator can make them feel more soothing, as long as the leaflet allows it. Cool compresses, avoiding rubbing and washing pollen from the face and hair in the evening help as well. If over-the-counter drops are not enough, a doctor may consider other options, including short courses of mild steroids under supervision.

A word on redness-relief drops

Decongestant drops make the eye look whiter by narrowing surface blood vessels. They do nothing for the cause of redness, and with regular use the vessels can rebound and become even redder, creating a cycle of dependency. They are best avoided or limited to occasional, short-term use. Red eyes that persist need an explanation, not a cosmetic fix; see our article on when a red eye is harmless or an emergency.

Antibiotic drops and ointments

Antibiotic drops treat bacterial infections of the eye surface, such as some forms of conjunctivitis, and serious corneal infections. They are also used after eye surgery to prevent infection.

It is important to know what antibiotics cannot do. Most cases of conjunctivitis in adults are viral, and many mild bacterial cases clear up on their own. Antibiotic drops have no effect on viral or allergic conjunctivitis, and using them unnecessarily contributes to antibiotic resistance. A doctor or, in some countries, a pharmacist will decide whether they are needed.

• Use them for the full course prescribed, even if the eye improves earlier.
• Do not reuse leftover antibiotic drops from a previous infection or share them with family members.
• Contact lens wearers with a painful red eye need same-day assessment: a corneal ulcer can progress very quickly and often requires intensive, specific treatment.

Steroid eye drops: effective but dangerous without supervision

Corticosteroid drops are powerful anti-inflammatory medicines. They are essential in conditions such as uveitis, severe allergic eye disease and after cataract or corneal surgery. Used under an eye doctor's care, they are safe and sight-saving. Used without supervision, they can cause serious harm, sometimes without any warning symptoms.

Some combination drops contain both an antibiotic and a steroid. These are also prescription-only and carry the same risks. If you have been prescribed steroid drops, keep your follow-up appointments, because your eye pressure needs to be checked. Do not stop long courses abruptly unless your doctor tells you to; many regimens are tapered gradually. Our guide to medications that affect the eyes covers steroid effects from tablets, inhalers and creams too.

Glaucoma drops

In glaucoma, lowering eye pressure is the only proven way to slow damage to the optic nerve. Drops are usually the first treatment. The main classes are:

The biggest problem in glaucoma treatment is not the drops themselves but missed doses. Because glaucoma usually causes no symptoms until late, many people forget or stop their drops. Linking the drop to a fixed daily routine, such as brushing your teeth, setting phone reminders and asking your doctor about combination drops or laser treatment if you struggle, all improve results. Never stop glaucoma drops on your own.

How to put in eye drops correctly

Correct technique means the drop lands where it should, less medicine is absorbed into the bloodstream and the bottle stays clean. Follow these steps:

1. Wash your hands with soap and water and dry them.
2. Check the bottle: right medicine, right eye, within the expiry and discard dates. Shake it if the leaflet says so (suspensions usually need shaking).
3. Remove contact lenses unless the drop is specifically approved for use with lenses. Usually you wait about 15 minutes before putting them back.
4. Tilt your head back or lie down and look up.
5. Pull down the lower eyelid gently with one finger to create a small pocket.
6. Hold the bottle above the eye, tip pointing down, without touching the eye, lashes or skin. Resting your hand on your forehead or the bridge of your nose steadies it.
7. Squeeze one drop into the pocket. One drop is enough: the eye can only hold a small volume, and extra drops simply run down your cheek.
8. Close your eye gently for one to two minutes without blinking hard or squeezing.
9. Press lightly on the inner corner of the eye, near the nose (punctal occlusion). This keeps the medicine in the eye longer and reduces absorption into the body, which is especially useful for glaucoma drops and for children.
10. Wipe away excess with a clean tissue, replace the cap and wash your hands again.

Waiting time between different drops

When you use more than one type of eye drop, the second can wash out the first if they are given too close together.

• Wait at least 5 minutes between different drops. Many eye doctors recommend 5 to 10 minutes.
• Suspensions (cloudy drops that need shaking) are often given after clear solutions.
• Gels and ointments always go last, because they form a layer that blocks other drops. Wait about 10 minutes before an ointment.
• If you use artificial tears as well as a medicated drop, give the medicine first and wait before lubricating, unless your doctor advises otherwise.
• Write down your schedule, especially after eye surgery, when several drops may be used several times a day.

Contamination, storage and discard dates

An eye drop bottle can be contaminated by bacteria or fungi if the tip touches the eye, fingers or any surface. Contaminated drops can cause serious infections, particularly if the cornea is already damaged.

• Never let the tip touch anything. If it does, wipe it with a clean tissue; if contamination is likely, replace the bottle.
• Most preserved multi-dose bottles must be discarded four weeks after opening, regardless of how much is left. Some products have different limits; check the leaflet and write the opening date on the box.
• Single-dose vials are meant to be used once and thrown away, usually within 12 to 24 hours of opening according to the product instructions.
• Store drops as the leaflet instructs. Some must be refrigerated before or after opening; do not leave them in a hot car.
• Never share eye drops, even within a family.
• Do not use homemade remedies, breast milk, saliva, tea or herbal liquids in the eyes: they are not sterile and have caused serious infections.

Eye drops for children, during pregnancy and in older adults

Children often resist drops. Putting the drop in the inner corner of the closed eye while the child lies down, then letting the child open the eye, can make it easier. Medicines are absorbed into the body more easily in small children, so pressing on the inner corner is particularly important. During pregnancy and breastfeeding, always ask a doctor or pharmacist before using medicated drops; lubricants are generally considered safe. Older adults may need help with dexterity, and their full list of tablets should be shared with the eye doctor because eye drops can interact with heart and lung conditions.

When to see a doctor

Over-the-counter lubricants and allergy drops are suitable for mild, short-term symptoms. Seek medical advice if your symptoms do not improve within a few days, or if you need drops for longer than you expected.

Bring all your drops, including over-the-counter products, to every eye appointment. Seeing the actual bottles helps your doctor spot duplications, preservatives you may not tolerate or drops that could be causing your symptoms.