Most steroid injections require little formal preparation, but a handful of steps in the days and hours beforehand can make the procedure safer and more comfortable. Whether you’re getting a shot in your knee, shoulder, spine, or soft tissue, here’s what to sort out ahead of time.
Tell Your Doctor About Blood Thinners Early
Blood-thinning medications are the single biggest preparation issue for steroid injections, especially spinal ones. Some need to be paused days or even weeks in advance, so bring this up as soon as the injection is scheduled rather than the day before.
The timelines vary significantly by medication. Warfarin typically needs to be stopped 4 to 5 days before the procedure. Clopidogrel requires a 7-day pause, and ticlopidine requires 14 days. Low-molecular-weight heparin (drugs like enoxaparin) should be held for at least 12 hours after the last preventive dose, or 24 hours if you’re on a higher treatment dose. IV heparin has a shorter window of 2 to 4 hours.
Never stop a blood thinner on your own. Your prescribing doctor and the doctor performing the injection need to coordinate, because pausing these drugs carries its own risks. They’ll decide together whether it’s safe to stop temporarily and whether you need a bridging strategy.
Flag Any Allergies, Even Minor Ones
Steroid injections aren’t just steroids. The syringe often contains a local anesthetic like lidocaine, plus inactive ingredients that hold the medication in suspension. These inactive ingredients are where surprise allergic reactions sometimes come from.
Common injectable steroids like methylprednisolone acetate and triamcinolone acetonide contain compounds called PEG (polyethylene glycol), polysorbate 80, or carboxymethylcellulose. If you’ve ever had an unexplained allergic reaction to a laxative, bowel prep solution, or a previous injection of any kind, mention it. These same compounds show up across many medical products, and a reaction to one can signal sensitivity to another.
A prior allergic reaction to corticosteroid injectables is an absolute contraindication to getting another one without further evaluation. Let your provider know about any history so they can choose a formulation that avoids your triggers or have you tested beforehand.
If You Have Diabetes, Plan for Blood Sugar Spikes
Corticosteroids reliably raise blood sugar, sometimes dramatically, and the effect can last several days. If you have diabetes, this is something to manage proactively rather than react to after the fact. Poorly controlled diabetes is listed as a relative contraindication to steroid injections in the latest multi-society guidelines, so your provider may want to see where your levels stand before proceeding.
Before the injection, ask your doctor whether you should adjust your insulin or oral medication doses in the days following the shot. You’ll want to monitor your blood sugar more frequently than usual, not just fasting values but also after meals and in the evening, since steroid-driven spikes tend to peak later in the day. Keep your glucometer and test strips stocked and ready. For many people the spike is manageable, but knowing it’s coming lets you stay ahead of it.
Eating and Drinking Before the Procedure
A standard steroid injection into a joint or soft tissue with only a local anesthetic does not require fasting. You can eat and drink normally beforehand.
The exception is if your procedure involves sedation, which is more common with spinal injections like epidurals or nerve blocks. In that case, current guidelines from the American Society of Interventional Pain Physicians recommend a minimum of 2 hours of fasting for clear liquids and 4 hours for a light meal. The old rule of nothing after midnight is no longer the standard, but your specific clinic may still have its own policy. Confirm fasting instructions when you schedule the appointment.
Check for Signs of Infection
Active infection anywhere in your body is a reason to reschedule. Steroids suppress local immune activity, which is exactly why they reduce inflammation, but that same effect can let an existing infection take hold or spread.
Your injection should be postponed if you have a fever, feel generally unwell, have had a bacterial or viral infection within the past two weeks, or have any skin infection near the injection site. An overlying skin infection and suspected joint infection are both absolute contraindications listed in current clinical guidelines. If you’re fighting something off, call ahead and reschedule rather than showing up and being sent home.
Time It Around Vaccines and Surgeries
If you’ve recently had a vaccination or have one coming up, spacing matters. The American Academy of Orthopaedic Surgeons recommends avoiding steroid injections within 2 weeks before or 1 week after vaccination. The concern is that the steroid’s local immune suppression could blunt your vaccine response. A general rule accepted in pain medicine is to keep at least a 1-week buffer on either side.
If you have joint replacement surgery on the horizon, the timing window is wider. Current guidelines recommend avoiding a corticosteroid injection into that joint within 3 months of planned surgery, and especially within 1 month. Steroid injections in the joint have been associated with a higher risk of post-surgical infection, so if surgery is being discussed, bring up the timing with your surgeon before scheduling the shot.
Arrange a Ride Home if Needed
For a simple joint injection in the knee, shoulder, or elbow, you can typically drive yourself. The injection site may be sore, but it won’t impair your ability to operate a vehicle.
Spinal injections are different. Epidural steroid injections, nerve root blocks, and facet joint injections near the spine often cause temporary numbness or weakness in the legs. Cleveland Clinic’s post-procedure guidelines state plainly: it is unsafe for you to drive after a spinal injection, and a responsible adult must drive you home. You can usually drive the next day unless told otherwise. Line up your ride before the appointment so it’s not a last-minute scramble.
Day-of Preparation
On the morning of the injection, wear loose, comfortable clothing that gives easy access to the injection site. If you’re getting a knee or hip injection, shorts or loose pants work well. For shoulder injections, a tank top or button-front shirt is easier than pulling a sweater over your head afterward.
Skip lotions, creams, and topical products on the skin around the injection area. The provider will clean the site with an alcohol swab before the injection, and a layer of product can interfere with skin preparation. Shower normally, just don’t apply anything to the area afterward.
If needle procedures make you anxious, eat a light meal or snack beforehand (assuming no sedation is planned). Low blood sugar combined with stress is a common trigger for feeling faint. Slow, deep breathing in the waiting room genuinely helps. Vasovagal responses, where you feel lightheaded or briefly pass out, are more common on an empty stomach and in anxious patients, and they’re almost always preventable with basic preparation. Let the staff know if you’ve fainted during procedures before so they can position you lying down rather than sitting upright.