In most cases you should stop ED medication such as Viagra or Cialis before surgery, because these drugs can interact with anaesthesia and lower blood pressure. How long to stop beforehand depends on the medicine and the operation, so the safe answer is always to tell your surgeon and anaesthetist what you take and follow their instructions. Never assume it is fine to take a dose around an operation.
Can you take ED meds before surgery?
ED medications such as Viagra (sildenafil) and Cialis (tadalafil) are popular treatments that help men achieve and maintain an erection by increasing blood flow. They do this by acting on nitric oxide pathways to relax and widen blood vessels — which also lowers blood pressure slightly. During surgery, anaesthetic agents and other drugs also affect blood pressure, and the combination can cause it to drop too far. That is why these medicines are generally paused before an operation rather than taken right up to it.
| Issue | Why it matters before surgery |
|---|---|
| Blood-pressure effect | Adds to anaesthesia's effect on blood pressure |
| Nitrate medicines | Never combine with ED drugs — dangerous drop in pressure |
| Timing | ED meds are usually stopped a set time before surgery |
| Disclosure | Anaesthesia staff must know what you take |
The interaction with anaesthesia
The American Association of Nurse Anesthetists and other bodies advise caution because ED medicines and anaesthesia both influence blood pressure. Taken together, they can cause an excessive fall in pressure during or after the procedure. There is also a rare reported risk involving vision (a form of sudden vision loss) when sildenafil, surgery and anaesthesia coincide. These risks are uncommon but real, which is exactly why timing and disclosure matter, much as they do with the broader safety rules in our guide to Viagra after a stroke.
How long before surgery should you stop?
There is no single universal answer: the safe gap depends on which medicine you take (Cialis lasts far longer than Viagra) and on the type of operation. Your surgical team will give you a specific timeframe to stop ED medication before the procedure. The most important step is simply to tell them — in advance — that you use it, and to follow their instructions rather than guessing. This is the same principle that applies to other health conditions, such as those covered in ED medication for diabetic patients.
The golden rule: ask first
Before any planned surgery, list every medication you take — including ED drugs and any nitrates — for your anaesthetist and surgeon. They can then tell you exactly when to stop and when it is safe to resume. Never restart Viagra or Cialis after an operation without checking, especially if you have a heart condition. When in doubt, the safe choice is to pause and ask, not to take a dose and hope.
Why honesty with the anaesthetist matters
Some men feel awkward disclosing that they use ED medication, and may be tempted to leave it off their list. This is a mistake that can have real consequences. Anaesthetists manage your blood pressure moment to moment during an operation, and they make decisions based on the drugs in your system. If sildenafil or tadalafil is present and unaccounted for, an unexpected drop in pressure can be harder to interpret and manage. Anaesthesia teams deal with this information routinely and without judgement — it is simply part of a safe medical history. A short, honest disclosure beforehand is far better than a complication on the table, and it costs you nothing but a moment of mild embarrassment.
What about emergency surgery?
Planned surgery gives time to stop ED medicines in advance, but emergencies do not. If you need urgent surgery and have recently taken Viagra or Cialis, tell the medical team immediately so they can take it into account. This is especially important because the longer-acting Cialis can remain active for well over a day. The team can then adjust how they manage your blood pressure and choose anaesthetic agents accordingly. The key, in both planned and emergency situations, is the same: the people looking after you must know what you have taken, so they can keep you safe — a principle that runs through all of our safety guidance, including other prostate and ED concerns.
Frequently asked questions
- Do I have to stop ED meds before every operation?
- Usually yes, but the exact timing depends on the medicine and the surgery. Your surgical team will tell you.
- What if I forgot to mention I take Viagra?
- Tell the anaesthesia staff as soon as possible — it can affect how your blood pressure is managed during surgery.
- When can I take it again afterwards?
- Only once your doctor confirms it is safe, which depends on your recovery and any other medicines.
For more safety guidance, return to our erectile dysfunction and Viagra hub.