Ophthalmology
Glaucoma eye drops
Pressure-lowering eye drops — Daily drops that lower eye pressure to protect sight in glaucoma.
Education and reference only. This is a plain-language class overview — it deliberately contains no doses. Always check the current Summary of Product Characteristics (SmPC), the BNF and your local formulary before prescribing or administering any medicine.
What it is
These eye drops lower the pressure inside the eye to slow or prevent the optic-nerve damage of glaucoma, protecting vision. They are generally used long-term, often for life.
How it works
Eye pressure depends on the balance between fluid produced inside the eye and fluid draining away. Different drops either improve drainage (e.g. prostaglandin analogues) or reduce fluid production (e.g. beta-blockers, carbonic-anhydrase inhibitors, alpha-agonists), lowering the pressure that threatens the optic nerve.
In practice
In practice glaucoma drops are usually lifelong and their whole purpose is to prevent irreversible sight loss by lowering the pressure in the eye, so adherence is everything — yet because glaucoma is symptomless until late, many people under-use their drops. First-line is usually a prostaglandin analogue once at night, which can gradually darken the iris and lengthen and thicken the lashes. Beta-blocker drops (such as timolol) are effective but are absorbed enough to cause systemic effects, so they are used cautiously in asthma, COPD and slow heart rates. A simple, high-value technique to teach is to close the eye and press gently on the inner corner for a minute after instilling a drop, which reduces drainage into the body and so reduces systemic side-effects. Where several drops are needed, fixed combinations cut the burden.
Examples
Practical use
How to take it & use it well
- Use your pressure-lowering eye drops every day at the recommended time, as they only work while you keep using them.
- Wash your hands, tilt your head back, gently pull down the lower lid and let a drop fall into the pocket without touching the eye with the bottle.
- After putting in the drop, close your eye and press gently on the inner corner near your nose for a short while, which reduces how much medicine reaches the rest of your body.
- If you use more than one type of drop, leave a few minutes between them so the first is not washed out by the second.
- Take out contact lenses before using drops that contain preservatives and follow your team's advice on when to put them back.
- Keep using the drops even though glaucoma usually causes no symptoms, because untreated raised pressure can quietly damage your sight.
Common uses
- Open-angle glaucoma
- Raised eye pressure (ocular hypertension)
Monitoring
- Eye pressure and optic-nerve/visual-field checks (by the eye service)
- Adherence and drop technique
- Systemic effects from absorbed drops
Weighing it up
Advantages & disadvantages
Advantages
- Lower the pressure inside the eye, which is the main way to protect the optic nerve and preserve sight in glaucoma.
- Can prevent or slow loss of vision when used consistently over the long term.
- Available in several types, such as prostaglandin analogues like latanoprost and beta-blockers like timolol, so treatment can be tailored.
- Once-daily options like latanoprost make a regular routine easier to keep.
Disadvantages
- Must usually be used for life, and good day-to-day adherence is essential but can be hard to maintain.
- Prostaglandin drops can darken the eye colour, lengthen lashes and cause eye redness or irritation.
- Beta-blocker drops can be absorbed into the body and affect the heart and lungs, so they are used with caution in asthma or some heart conditions.
- Drops can sting, blur vision briefly, or cause local irritation, which some people find off-putting.
Key safety principles
What to watch for
- Beta-blocker drops are absorbed systemically — caution in asthma, COPD and slow heart rates.
- Prostaglandin analogues can darken the iris and change eyelashes; some drops sting or redden the eye.
- Adherence is critical — glaucoma is symptomless until sight is lost.
Key interactions
What to avoid or check alongside
- Timolol and other beta-blocker drops can add to the effect of beta-blocker tablets, slowing the heart rate and lowering blood pressure.
- Beta-blocker drops can worsen breathing in people with asthma or chronic obstructive pulmonary disease.
- Combining beta-blocker drops with some heart-rate-lowering medicines, such as certain calcium channel blockers, may slow the heart too much.
- Using several eye drops close together can wash one another out, reducing their effect, so space them apart.
- Tell your eye team and pharmacist about all medicines, as even drops are absorbed and can interact.
Patient & carer advice
- Use the drops exactly as prescribed, every day — even though the eye feels normal
- After a drop, close the eye and press the inner corner for a minute to cut side-effects
- Tell us about asthma, breathing or heart conditions before using beta-blocker drops
Answers
Glaucoma eye drops: frequently asked questions
Why must I keep using glaucoma drops if my eyes feel fine?
Glaucoma usually causes no symptoms until sight is already lost. The drops keep the eye pressure down to protect the optic nerve, so they must be used every day even when your eyes feel normal.
What is nasolacrimal occlusion and why does it help?
It means gently pressing on the inner corner of the eye near the nose after a drop. This stops the medicine draining away and being absorbed into the body, so more stays in the eye and side effects are reduced.
Can timolol eye drops affect my heart or breathing?
Yes. Timolol is a beta-blocker and some is absorbed into the body. It can slow the heart and may worsen asthma or some breathing problems, so tell your team about any chest or breathing conditions.
Should I space out my different eye drops?
Yes. If you use more than one drop, leave a few minutes between them. Otherwise the second drop can wash the first one out before it has been absorbed, reducing how well it works.
Authoritative sources
Always verify against the source
This overview is for orientation. For doses, interactions, contra-indications and the full monograph, use:
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