Medicines to Tell Your Surgeon About Before Cataract Surgery

Cataract surgery rarely requires you to stop anything you are taking, but it does require your team to know exactly what that is, because a handful of common medicines change how the eye behaves during the operation or how it is planned¹. The mistake people make is not taking the wrong tablet; it is arriving at the cataract assessment with a vague memory of a list instead of the list itself.

This is a practical companion to questions to ask before cataract surgery and what happens on the day of cataract surgery. For the operation itself, see cataract surgery.

Why the list matters more than any single tablet

The surgery is short, small-incision and usually done under local anaesthetic, so most regular medicines simply carry on². That is the reassuring headline, and it is true for the great majority of people.

The reason the list still matters is that cataract surgery is planned in fine detail before anyone touches your eye. The lens power is calculated from measurements, the anaesthetic approach is chosen, and the surgeon forms an expectation of how your pupil and your tissues will behave. A medicine that quietly alters one of those expectations is far easier to work around when it is written on the form than when it announces itself halfway through the operation.

So the job is not to guess what is relevant. It is to hand over everything and let the people planning the operation decide.

Alpha blockers, including tamsulosin

Alpha blockers taken for prostate symptoms, tamsulosin most commonly, are associated with the iris becoming floppy and the pupil harder to keep open during surgery³. This is the single most important medicine to declare, and the one most often forgotten.

The pupil has to stay wide for the surgeon to work through it. These drugs relax the muscle that holds it open, and the result during surgery is a pupil that narrows unhelpfully and an iris that moves when it should stay put. It is well recognised and thoroughly manageable: there are drugs, devices and techniques that handle it, and a surgeon who knows in advance plans for it as a matter of routine.

Two things people get wrong here. First, they assume that stopping the tablets before surgery solves it. The effect can persist long after the last dose, so stopping is not a reliable fix and is not usually asked for. Second, they assume a drug taken years ago is irrelevant. Mention it anyway, however long ago, and let the surgeon decide what to do with the information.

Blood thinners and antiplatelets

For routine cataract surgery under local anaesthetic, anticoagulants and antiplatelets are usually continued rather than stopped³. The incision is around 2 to 3 mm and self-sealing, and the bleeding risk is genuinely low.

Set against that, stopping a blood thinner carries real risk of its own, which is why nobody wants you doing it unprompted. Warfarin, the newer direct oral anticoagulants, clopidogrel and aspirin all fall into this category. If your team does want something changed, they will tell you precisely what and for how long, and they will be the ones to say it.

What they will want to know is which drug, what dose, why you take it, and, for warfarin, how your monitoring has been running. If you are on warfarin you may be asked for a recent reading before the day. Ask at the assessment rather than assuming.

Steroids, diabetes medicines and the fasting question

Long-term steroids are one of the recognised causes of cataract, alongside ageing, diabetes, eye injury and some genetic conditions⁴. Declaring them is partly explanation and partly planning.

Include inhaled steroids, steroid creams and any long courses of tablets. People leave these off because they do not feel like proper medicines, but they belong on the list, and they can also be relevant to how the eye settles and to the anti-inflammatory drops you will be prescribed afterwards.

Diabetes medicines matter for a different reason. Cataract surgery is a day case and you are usually awake, so the fasting instructions are far lighter than for a general anaesthetic, but they still interact with insulin and tablets that lower blood sugar. Get specific instructions from your own team, in writing if you can, and do not extrapolate from a friend’s hip operation. If diabetes is part of your picture, cataracts and diabetes covers the wider ground.

The drops you already use

Existing eye drops have to be fitted around the antibiotic and anti-inflammatory drops used for about 2 to 4 weeks after surgery². That schedule needs planning, not improvising.

Glaucoma drops are the obvious case, and if you have both a cataract and glaucoma the surgery itself may be planned differently, which cataracts and glaucoma goes into. But lubricants count too, especially if you have dry eye, because a dry, irregular eye surface can unsettle the measurements used to choose your lens as well as your comfort afterwards. That overlap is covered in cataract surgery and dry eye.

My own cupboard, and the list I finally wrote

I went to my first assessment confident I could recite what I took, and I got about halfway before I dried up on the name of the one for my blood pressure. The nurse was entirely unbothered and told me half the people who sit in that chair do the same thing. She also asked, pointedly, about anything I bought myself, which is how my fish oil and my hay fever tablets ended up on the record.

Before the second eye I did it properly. I lined every box up on the kitchen table, photographed them, and printed the list with the doses on it. It took ten minutes and it made the whole appointment calmer, because instead of digging through my memory I could spend the time asking about my lens.

If you take one thing from this article, take that. A written, current list, brought to the assessment, including the things you would not think to mention. It is the least glamorous piece of preparation for cataract surgery and one of the few where you can be genuinely helpful to the person operating on you.