What "premedication" actually means
Antibiotic premedication, sometimes called antibiotic prophylaxis, simply means taking a dose of antibiotic before a dental procedure rather than to treat an existing infection. The goal is preventive: certain procedures can briefly release the bacteria that naturally live in your mouth into your bloodstream, and the antibiotic reduces the chance those bacteria cause harm elsewhere in the body.
For the vast majority of healthy patients, this isn't necessary. Your immune system clears those everyday bacteria without any trouble, and taking antibiotics you don't need carries its own small risks. Premedication is reserved for a specific group of people for whom the stakes of an infection are unusually high.
Who is most likely to need it
The clearest reason for premedication is a small set of high-risk heart conditions, because of the danger of a serious infection of the heart lining or valves called infective endocarditis. Current cardiology and dental guidelines focus premedication on people with:
- A prosthetic (artificial) heart valve, or prosthetic material used to repair a valve
- A previous episode of infective endocarditis
- Certain congenital heart conditions — particularly unrepaired cyanotic defects, or defects repaired with prosthetic material within the past six months
- A heart transplant that has since developed a valve problem
If any of these apply to you, your cardiologist is the right person to confirm whether you need premedication, and we'll coordinate with that advice.
Why the guidance on joint replacements changed
For many years, patients with hip and knee replacements were routinely told to take antibiotics before dental visits. That advice has since changed. After reviewing the evidence, dental and orthopaedic bodies concluded that for most people with prosthetic joints, routine premedication before dental procedures is no longer recommended, the risk it was meant to prevent turned out to be very low, and the downsides of unnecessary antibiotics were real.
That said, this isn't absolute. Some surgeons still recommend premedication for specific patients, for example, in the period soon after surgery or for someone with a weakened immune system. If your orthopaedic surgeon has given you written instructions, follow them and bring them to us. When surgeon and dentist coordinate, you get the safest plan.
Antibiotics are not a substitute for treatment
One of the most important things to understand is that antibiotics don't fix a dental problem, they only buy time against the bacterial part of it. A cavity, an infected nerve, or an abscess will keep causing problems until the underlying cause is treated directly. That usually means a filling, a root canal to remove the infected pulp, or an extraction.
Sometimes we'll prescribe a short course of antibiotics alongside treatment, for example, when there's significant swelling or spreading infection. But antibiotics are a support, not a cure, and taking them on their own while leaving the tooth untreated tends to let the problem return, often worse.
Antibiotic stewardship: why we don't over-prescribe
Antibiotics are a shared resource. The more they're used when they aren't needed, the faster bacteria develop resistance, which makes serious infections harder to treat for everyone. This is called antibiotic stewardship, and it's a real responsibility for healthcare providers, including dentists.
That's why we prescribe premedication and antibiotics deliberately rather than by default: only when your medical history or a genuine infection calls for it. It's not about withholding care, it's about giving you exactly the care that helps and nothing that doesn't.
What to do before your appointment
The single most helpful thing you can do is tell us your medical history, when you book and again at your visit. Mention any heart condition, joint replacement, weakened immune system, or medication that affects your immune response. If your physician, cardiologist, or surgeon has given you instructions about premedication, bring them in writing.
With that information in hand, we'll confirm whether premedication is appropriate, arrange the correct antibiotic and timing if it is, and make sure your treatment, whether it's a routine visit or something more involved, is planned safely around your health.