{"id":3367,"date":"2025-09-29T13:17:28","date_gmt":"2025-09-29T13:17:28","guid":{"rendered":"https:\/\/www.londoncataractcentre.co.uk\/blog\/?p=3367"},"modified":"2025-09-29T13:17:31","modified_gmt":"2025-09-29T13:17:31","slug":"what-medications-are-given-during-cataract-surgery","status":"publish","type":"post","link":"https:\/\/www.londoncataractcentre.co.uk\/blog\/what-medications-are-given-during-cataract-surgery\/","title":{"rendered":"What Medications Are Given During Cataract Surgery?"},"content":{"rendered":"\n
Cataract surgery is famously quick and, for most people, surprisingly comfortable. What\u2019s less visible is the careful choreography of medicines before, during and after the operation that keeps your eye safe, quiet and pain-free while it heals. If you\u2019re preparing for surgery, understanding these drugs\u2014what they are, why they\u2019re used and how they may feel\u2014can make the whole experience less mysterious and a lot more reassuring. In this guide, I\u2019ll walk you through the typical medicines patients encounter on the day, explain how your team tailors choices to your health, and share practical tips so you know exactly what to expect.<\/p>\n\n\n\n
Why medications matter in cataract surgery<\/strong><\/h2>\n\n\n\n
At first glance, cataract surgery looks like a purely mechanical task: a tiny incision, ultrasound to soften and remove the cloudy lens, and a crystal-clear artificial lens (IOL) slipped into place. But the success of that five-to-fifteen-minute sequence rests on pharmacology. Medicines help to dilate the pupil, numb the surface, calm the eye\u2019s internal nerves, keep the iris stable, prevent bacterial contamination, reduce inflammation, control eye pressure, and keep you relaxed. The doses are tiny, the timing is precise, and every choice is designed to minimise risk while maximising comfort and visual results.<\/p>\n\n\n\n
Think of the medications as the backstage crew at a theatre production. You don\u2019t see them directly, but nothing runs smoothly without their work. When people say the procedure felt \u201ceasy\u201d, it\u2019s usually because the medicines did their job.<\/p>\n\n\n\n
The big picture: a simple timeline of the drugs you may receive<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\n
Before we look at each medicine in detail, it helps to picture where they fit into the day:<\/p>\n\n\n\n
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Pre-assessment and the days before surgery: sometimes anti-inflammatory drops (an NSAID) are started to prime the eye. You may be asked to continue your usual medicines, with specific advice about blood thinners or diabetes medication depending on local protocols.<\/li>\n\n\n\n
On arrival to the surgical centre: antiseptic preparation (povidone-iodine) and dilating drops (tropicamide and\/or phenylephrine). Some units also use an NSAID drop before theatre to help maintain dilation and reduce post-op inflammation. If you\u2019re anxious, you may be offered a small dose of a short-acting sedative.<\/li>\n\n\n\n
In theatre: topical anaesthetic drops or gel; sometimes a small amount of preservative-free lidocaine inside the eye; viscoelastic (not a drug, but a protective gel); intracameral antibiotic near the end of the case; sometimes agents to stabilise the iris or reduce internal inflammation.<\/li>\n\n\n\n
Immediately after surgery and the first few weeks: antibiotic drops for a short course (depending on local policy) and a tapering anti-inflammatory regimen (usually a steroid, sometimes combined with an NSAID).<\/li>\n<\/ol>\n\n\n\n
That\u2019s the outline. Now, let\u2019s unpack the classes one by one so you can recognise the names and understand why they\u2019re used.<\/p>\n\n\n\n
Antiseptic preparation: the single most important step you\u2019ll never feel<\/strong><\/h2>\n\n\n\n
Long before any incision, your team will clean the eyelashes and the ocular surface with povidone-iodine, an iodine-based antiseptic. This isn\u2019t strictly an \u201cantibiotic\u201d, but it\u2019s the most powerful, evidence-backed way to reduce bacterial counts on the eye and eyelids. It dramatically lowers the already small risk of endophthalmitis (a severe, sight-threatening infection). You might notice a mild stinging and a brownish tint around the eye for a moment, but that passes quickly. If you have an iodine or shellfish allergy, do mention it\u2014modern practice can usually still proceed safely, but your team will choose the right prep and monitor you closely.<\/p>\n\n\n\n
Dilating and iris-stabilising medicines: keeping the view wide and steady<\/strong><\/h2>\n\n\n\n
Your surgeon needs a wide, stable pupil to work safely. That\u2019s achieved with mydriatic drops instilled on the ward before theatre:<\/p>\n\n\n\n
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Tropicamide relaxes the pupil\u2019s constrictor muscle so the pupil opens.<\/li>\n\n\n\n
Phenylephrine stimulates the dilator muscle to enhance dilation.<\/li>\n<\/ul>\n\n\n\n
You\u2019ll likely notice brighter lights feeling a bit dazzling for a few hours\u2014bring sunglasses for the journey home. Some centres add an NSAID drop around this time; it doesn\u2019t dilate directly but helps prevent the pupil from \u201ccoming down\u201d during surgery by damping inflammatory signals.<\/p>\n\n\n\n
If you\u2019ve ever taken tamsulosin (for prostate symptoms) or similar alpha-1 blockers, tell your team. These medicines can cause intraoperative floppy iris syndrome (IFIS), where the iris billows and constricts unpredictably. Surgeons manage this with a combination of strategies: a different dilating plan, gentle fluidics, viscoelastic that supports the iris, micro-devices (like pupil expansion rings), and sometimes intracameral phenylephrine to firm the iris. With the right preparation, IFIS becomes a manageable, rather than worrying, issue.<\/p>\n\n\n\n
Anaesthesia and comfort: numbing the eye, calming the nerves<\/strong><\/h2>\n\n\n\n
Most modern cataract operations are done with topical anaesthesia\u2014numbing the surface of the eye\u2014so you don\u2019t feel pain but remain awake and able to follow simple instructions. You might be offered:<\/p>\n\n\n\n
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Topical anaesthetic drops such as proxymetacaine or oxybuprocaine. These work within seconds and last long enough for the procedure. A lidocaine gel may follow for a cushioned, longer effect.<\/li>\n\n\n\n
Intracameral lidocaine (preservative-free): a tiny amount placed inside the eye at the start can quieten the iris and internal structures, reducing any dull ache or light sensitivity during the early steps.<\/li>\n<\/ul>\n\n\n\n
If you\u2019re very anxious\u2014or if there are specific clinical reasons\u2014your anaesthetist may suggest:<\/p>\n\n\n\n
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Mild IV sedation, typically a very small dose of midazolam (to relax) and sometimes an opioid like fentanyl (to blunt any brief pressure sensation).<\/li>\n\n\n\n
Regional blocks (sub-Tenon\u2019s or peribulbar) in selected cases: a local anaesthetic is placed around the eye to numb sensation and reduce eye movement. This is common if the case is predicted to be longer or if you strongly prefer not to feel anything at all.<\/li>\n\n\n\n
General anaesthesia is rare for routine cataracts but can be used for certain medical needs or in patients who cannot lie flat or keep still comfortably.<\/li>\n<\/ul>\n\n\n\n
It\u2019s worth saying: feeling gentle pressure, cool fluid, or a soft touch around the eyelids is normal, but you should not feel sharp pain. If you do, speak up\u2014your team can top up the anaesthetic quickly.<\/p>\n\n\n\n
Antibiotics: preventing infection from the inside out<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\n
While antisepsis is the cornerstone, most UK centres also use an intracameral antibiotic\u2014a tiny dose placed into the front of the eye at the end of surgery\u2014to further reduce endophthalmitis risk. The most common choices are:<\/p>\n\n\n\n
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Cefuroxime, widely used and well studied.<\/li>\n\n\n\n
Moxifloxacin, often chosen if there\u2019s a serious penicillin\/cephalosporin allergy or based on surgeon preference and availability.<\/li>\n<\/ul>\n\n\n\n
Because the dose is tiny and delivered exactly where it\u2019s needed, systemic side-effects are very uncommon. You may still be prescribed topical antibiotic drops for a short course after surgery (practices vary by centre). If you\u2019ve ever had a drug reaction, bring it up at pre-assessment\u2014your plan can be tailored.<\/p>\n\n\n\n
Anti-inflammatory medicines: quieting the eye\u2019s natural response<\/strong><\/h2>\n\n\n\n
Any surgery triggers inflammation, and the eye is no exception. You\u2019ll typically use one or both of these after surgery:<\/p>\n\n\n\n
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Topical corticosteroids (e.g., prednisolone acetate or dexamethasone) reduce swelling and quell the cells that drive inflammation. They usually start at a higher frequency and taper over a few weeks.<\/li>\n\n\n\n
Topical NSAIDs (e.g., ketorolac, bromfenac, nepafenac, diclofenac) target prostaglandins, complementing steroids and helping to reduce the risk of cystoid macular oedema (CMO).<\/li>\n<\/ul>\n\n\n\n
If you\u2019re a glaucoma patient or have a history of uveitis or diabetes, your anti-inflammatory plan may be longer or more intensive. If you\u2019re steroid-responsive (your pressure tends to rise on steroid drops), your follow-up schedule will include pressure checks and your taper may be quicker or paired with pressure-lowering drops as needed.<\/p>\n\n\n\n
Pressure-lowering agents: smoothing the early post-op hours<\/strong><\/h2>\n\n\n\n
A transient rise in eye pressure can happen in the first day or two. Most people don\u2019t notice it, but if you\u2019re at risk\u2014or if the pressure ticks up at review\u2014you may receive:<\/p>\n\n\n\n
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Acetazolamide (tablets), which reduces fluid production inside the eye.<\/li>\n\n\n\n
Topical pressure-lowering drops such as beta-blockers, alpha-agonists, or carbonic anhydrase inhibitors.<\/li>\n<\/ul>\n\n\n\n
These are usually short-term. If you already use glaucoma drops, you\u2019ll get clear instructions about continuing them straight through surgery unless told otherwise.<\/p>\n\n\n\n
Agents used within the eye: small helpers you may never hear about<\/strong><\/h2>\n\n\n\n
Some helpful medicines work silently inside the eye during the operation:<\/p>\n\n\n\n
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Intracameral phenylephrine can help keep the iris stable and the pupil wide in challenging situations.<\/li>\n\n\n\n
Viscoelastic gels (not a medicine, but worth mentioning) protect the corneal endothelium and create space for manoeuvres. These are meticulously removed at the end to reduce the chance of a pressure rise.<\/li>\n<\/ul>\n\n\n\n
You won\u2019t feel these, and they\u2019re part of standard microscopic micro-dosing that makes modern surgery safe.<\/p>\n\n\n\n
Sedation and comfort medicines: keeping you relaxed but present<\/strong><\/h2>\n\n\n\n
Most people do well with no sedation at all, but if you\u2019re tense or claustrophobic, a whisper of midazolam can make a world of difference. The aim is \u201cI feel fine,\u201d not \u201cI don\u2019t remember anything.\u201d You\u2019ll breathe for yourself, you can respond to gentle instructions, and you\u2019ll be back in recovery within minutes. Some centres also give an anti-sickness tablet if you\u2019re prone to nausea.<\/p>\n\n\n\n
If you prefer to avoid sedation entirely, say so\u2014there\u2019s no obligation. Equally, if you\u2019d feel better with it, let the team know early so it\u2019s planned into your pathway.<\/p>\n\n\n\n
What you\u2019ll likely take home<\/strong><\/h2>\n\n\n\n
When you leave, you can expect a simple drop plan and clear written instructions. A common regimen looks like this (yours may differ):<\/p>\n\n\n\n
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Antibiotic drops: 4 times a day for one week.<\/li>\n\n\n\n
Steroid drops: 4 times a day for 1\u20132 weeks, then taper to twice daily for a further 1\u20132 weeks.<\/li>\n\n\n\n
NSAID drops: once or twice daily for 3\u20134 weeks.<\/li>\n<\/ul>\n\n\n\n
You\u2019ll also receive advice on spacing drops, hand hygiene, and what to do if your eye suddenly gets very sore, red, or vision worsens.<\/p>\n\n\n\n
Special situations your team plans for<\/strong><\/h2>\n\n\n\n
You take blood thinners.<\/strong> Most cataract surgery uses tiny incisions and doesn\u2019t require stopping anticoagulants, but your surgeon and anaesthetist will confirm a plan. Bruising around the eye is more likely with certain regional blocks than with purely topical anaesthesia, so the chosen technique may reflect this.<\/p>\n\n\n\n
You have severe dry eye or blepharitis.<\/strong> Expect more attention to lid hygiene beforehand, preservative-free drops where possible, and careful surface lubrication during surgery. Pre-treating the lids can improve your day-one comfort and vision.<\/p>\n\n\n\n
You have diabetes.<\/strong> Your anti-inflammatory plan may be longer to reduce CMO risk, and your review schedule may include a macular scan. Your usual diabetes medications will be managed around fasting and theatre times\u2014this will be spelled out at pre-assessment.<\/p>\n\n\n\n
You\u2019ve had previous eye surgery.<\/strong> Prior corneal grafts, glaucoma surgery, vitrectomy, or high myopia can influence intraoperative agents and post-op anti-inflammatory duration. Trust that your notes are read carefully and the plan reflects them.<\/p>\n\n\n\n
You are allergic to certain drugs.<\/strong> Alternatives exist for almost every step. Be specific about past reactions so the team can separate true allergy from intolerance.<\/p>\n\n\n\n
Side-effects to know about (and what to do)<\/strong><\/h2>\n\n\n\n
Most drops are very well tolerated. Here\u2019s what you might notice and how to respond:<\/p>\n\n\n\n
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Stinging on instillation is common and usually eases quickly.<\/li>\n\n\n\n
Light sensitivity and glare are common on day one due to dilation.<\/li>\n\n\n\n
Mild eyelid redness or itch can be managed with cool compresses.<\/li>\n\n\n\n
Pressure rise from steroids is unusual in the short term, but if you develop brow ache or halos, mention it.<\/li>\n\n\n\n
A rash or significant swelling is rare\u2014stop the suspected drop and call the clinic.<\/li>\n<\/ul>\n\n\n\n
If something feels \u201cnot right\u201d, ask. It\u2019s always safer to check.<\/p>\n\n\n\n
What about \u201cdropless\u201d cataract surgery?<\/strong><\/h2>\n\n\n\n
You may hear about approaches that use intraoperative sustained-release steroid or combine intracameral antibiotic with a depot anti-inflammatory to reduce or even eliminate post-op drops. These methods are evolving and can be very convenient for people who struggle with drops. Not every centre adopts them and not every eye is a good candidate, but it\u2019s worth asking your surgeon whether there\u2019s a drop-simplified pathway that suits your circumstances.<\/p>\n\n\n\n
How your team tailors the medication plan to you<\/strong><\/h2>\n\n\n\n
Tailoring is the norm in modern cataract care. Expect your plan to reflect:<\/p>\n\n\n\n
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Your medical history.<\/li>\n\n\n\n
Your current medicines.<\/li>\n\n\n\n
Your eye\u2019s anatomy.<\/li>\n\n\n\n
Your preferences.<\/li>\n<\/ul>\n\n\n\n
Don\u2019t be shy about your preferences\u2014good teams want to accommodate them.<\/p>\n\n\n\n
Practical tips for the smoothest medication experience<\/strong><\/h2>\n\n\n\n
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Bring a current medicines list to pre-assessment.<\/li>\n\n\n\n
Ask about brand vs. generic.<\/li>\n\n\n\n
Practise drop technique before the day.<\/li>\n\n\n\n
Space out your bottles.<\/li>\n\n\n\n
Use a chart or phone reminder.<\/li>\n\n\n\n
Keep sunglasses handy for the ride home.<\/li>\n<\/ul>\n\n\n\n
\u201cIf I\u2019m on blood thinners, I can\u2019t have cataract surgery.\u201d<\/li>\n<\/ul>\n\n\n\n
Bringing it all together<\/strong><\/h2>\n\n\n\n
The \u201cmedication bundle\u201d around cataract surgery is deliberately simple for you to follow but sophisticated behind the scenes. Broadly, you\u2019ll meet antiseptic prep, dilating drops, numbing drops or gel, maybe a touch of sedative, an intracameral antibiotic, and a short course of anti-inflammatory drops. If you have specific risks, you\u2019ll also see pressure-lowering drops or tailored anti-inflammatory plans. Each piece exists for a clear reason and contributes to that satisfying day-one moment when the world looks brighter and crisper.<\/p>\n\n\n\n
1) Will I be awake during cataract surgery, and will it hurt?<\/strong> Yes, most cataract surgeries are performed while you are awake. Anaesthetic drops or gel numb the surface of your eye so you don\u2019t feel sharp pain. You may notice pressure, cool liquid moving across the eye, or see bright lights from the microscope, but these sensations are usually mild. If you feel very anxious, you may be offered a small amount of sedation to help you relax while still being able to respond to instructions. In rare cases, a local anaesthetic injection or even general anaesthesia can be used if necessary.<\/p>\n\n\n\n
2) What if I\u2019m allergic to penicillin or antibiotics?<\/strong> A penicillin allergy will not prevent you from having cataract surgery. The antibiotic most commonly used at the end of surgery is cefuroxime, which is not a penicillin but belongs to the cephalosporin group. If you have a confirmed allergy to cephalosporins, your surgeon may use an alternative such as moxifloxacin. These medicines are placed directly into the eye in tiny amounts, making systemic reactions extremely rare. The key is to give your care team a full description of any previous allergic reaction so they can safely adapt your treatment.<\/p>\n\n\n\n
3) I take tamsulosin for prostate problems\u2014will that affect the operation?<\/strong> Yes, tamsulosin and related medicines can make the iris more floppy during surgery, a condition known as intraoperative floppy iris syndrome (IFIS). This can make the pupil narrower or unstable, which would make the operation trickier without preparation. Surgeons are very familiar with IFIS and manage it by using stabilising gels, special dilating medicines, or small devices that hold the pupil open. With these measures, cataract surgery remains safe, and your vision outcome is not usually affected.<\/p>\n\n\n\n
4) Do I need to stop blood thinners like warfarin or apixaban before surgery?<\/strong> In most cases you can continue taking your blood thinners. Cataract surgery is performed through very small incisions, so the risk of significant bleeding is minimal. Stopping anticoagulants can increase the risk of blood clots, which is usually a greater danger than a small bruise around the eye. If you are taking strong anticoagulants or dual antiplatelet therapy, your surgeon and anaesthetist may make small adjustments to the anaesthetic technique rather than stopping your medication. Always follow the advice given at your pre-assessment.<\/p>\n\n\n\n
5) How long will I need to use eye drops afterwards?<\/strong> Typically, you\u2019ll be prescribed antibiotic drops for around a week and anti-inflammatory drops for three to four weeks. Steroid drops are often tapered gradually, starting with frequent doses and then reducing as the eye heals. In some cases\u2014such as patients with diabetes or uveitis\u2014the course may be longer to protect the retina from swelling. You\u2019ll receive clear written instructions about how often to use the drops, how to taper them, and when to stop.<\/p>\n\n\n\n
6) What side-effects might I notice from the drops?<\/strong> Mild stinging or burning when the drops are instilled is very common and usually fades within a minute. Some patients notice a temporary bitter taste in the mouth after putting drops in\u2014this is harmless and can be reduced by pressing gently on the corner of the eye near the nose. Redness, dryness, or mild itching can also occur, especially if the drops contain preservatives. More serious side-effects such as swelling, spreading redness, or a sudden fall in vision are rare, but they should be reported immediately to the clinic so they can be checked.<\/p>\n\n\n\n
7) Are there drop-free or \u201cdropless\u201d cataract surgery options?<\/strong> Yes, some centres now use dropless approaches, where the antibiotic and anti-inflammatory medicines are placed inside the eye during surgery in a slow-release form. This can reduce or remove the need for you to use drops afterwards, which is especially useful if you struggle with arthritis, tremor, or poor vision in your other eye. However, dropless surgery is not suitable for everyone\u2014for example, if you are at higher risk of retinal swelling or have a complex medical history, standard drops may still be preferred. It\u2019s worth asking your surgeon if this option is available to you.<\/p>\n\n\n\n
8) I have glaucoma\u2014will cataract surgery affect my eye pressure?<\/strong> In the first day or two, it is common for the pressure inside the eye to rise slightly. Your surgeon may prescribe tablets or drops to control this, especially if you already have glaucoma. In the longer term, cataract surgery can sometimes lower pressure by opening up the drainage channels inside the eye, which can be a bonus for people with glaucoma. However, it is not a replacement for glaucoma treatment\u2014you will still need to continue your prescribed drops or procedures as advised by your eye specialist.<\/p>\n\n\n\n
9) Can the medicines used affect other health conditions like diabetes?<\/strong> The eye drops used during and after cataract surgery act locally, so they don\u2019t usually affect other medical conditions. For people with diabetes, the main concern is protecting the retina from swelling (cystoid macular oedema). To reduce this risk, you may be prescribed anti-inflammatory drops for a longer period or have an extra retinal scan after surgery. If you have heart, lung, or kidney conditions, your anaesthetist will also choose sedation medicines carefully to avoid any complications.<\/p>\n\n\n\n
10) What if I can\u2019t manage putting drops in on my own?<\/strong> This is a very common concern, especially for patients with arthritis, hand tremors, or poor eyesight. There are several solutions: you can use a drop-aid device that makes it easier to squeeze the bottle, you can arrange help from a family member or friend, or you may be referred to a community nurse. In some cases, a simplified or dropless treatment pathway can be offered. The most important thing is to mention any difficulty before surgery so that support can be arranged in advance.<\/p>\n\n\n\n
Final thoughts<\/strong><\/h2>\n\n\n\n
Cataract surgery is one of the safest and most effective procedures in modern medicine, and the role of medications is central to that success. From the numbing drops that keep you comfortable to the antibiotics and anti-inflammatory treatments that protect your vision afterwards, each medicine is carefully chosen and timed to give you the best possible result. Understanding what these drugs do helps take away much of the mystery and makes the day itself far less daunting.<\/p>\n\n\n\n
It\u2019s important to remember that your medication plan isn\u2019t one-size-fits-all. Factors such as your general health, the medicines you already take, and the specific needs of your eyes will all shape the choices your surgical team makes. This tailored approach is what allows cataract surgery to work so smoothly for so many different people, even when medical histories are complex.<\/p>\n\n\n\n
If you\u2019re feeling unsure about any part of the process\u2014whether it\u2019s anaesthesia, drops, or potential side-effects\u2014the best step is to raise your questions at your consultation. Nothing is too small to ask, and the answers will give you confidence in your treatment journey.<\/p>\n\n\n\n
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