Cosentyx is a self-injected medication given under the skin using a prefilled pen or syringe. Most people start with a loading phase of weekly injections for the first five weeks, then switch to one injection every four weeks for ongoing maintenance. The exact dose and schedule depend on the condition being treated, but the injection technique itself is the same across all uses.
Dosing Schedules by Condition
For plaque psoriasis, the standard dose is 300 mg injected at weeks 0, 1, 2, 3, and 4 (the loading phase), followed by 300 mg every 4 weeks after that. Each 300 mg dose requires two separate injections of 150 mg, given one right after the other at different spots on your body. Some people may use a lower 150 mg dose if their prescriber determines it’s appropriate.
For psoriatic arthritis without significant skin involvement, the dose is typically 150 mg on the same weekly loading schedule (weeks 0 through 4), then 150 mg every 4 weeks. Your prescriber may skip the loading phase entirely and start you at 150 mg every 4 weeks from the beginning. If symptoms persist, the dose can be increased to 300 mg. If you also have moderate to severe plaque psoriasis alongside your joint disease, you’ll follow the higher psoriasis dosing schedule instead.
Ankylosing spondylitis follows a similar pattern: 150 mg with or without a loading phase, then 150 mg every 4 weeks ongoing.
How to Prepare Your Injection
Take the Cosentyx Sensoready pen out of the refrigerator 15 to 30 minutes before you plan to inject. Letting it warm to room temperature makes the injection more comfortable. Do not shake the pen.
Gather your supplies: the pen, an alcohol wipe, a cotton ball, and a sharps disposal container. Wash your hands thoroughly, then clean the injection site with the alcohol wipe and let the skin air dry. Before injecting, check the liquid through the viewing window on the pen. It should look clear and colorless to slightly yellow. If the liquid appears cloudy, discolored, or has visible particles floating in it, don’t use that pen.
Step-by-Step Injection Process
Twist off the pen cap and discard it. Don’t try to put the cap back on. Hold the pen in a fist grip, position it at a 90-degree angle to your skin, and press it firmly against the injection site. The pen will click twice. The first click means the injection has started. The second click signals it’s almost finished, but keep holding the pen in place until all the medication has been dispensed. Then lift the pen straight away from your skin.
The entire injection takes only seconds. If you need two injections for a 300 mg dose, repeat the full process at a different spot on your body using a second pen.
Where to Inject
The three recommended areas are the front of your thighs, your lower abdomen, and (if a caregiver is giving the injection) the upper outer arms. When using your abdomen, stay at least 2 inches away from your belly button in any direction. Avoid injecting into skin that is tender, bruised, red, hard, or affected by psoriasis plaques.
Rotate your injection site every time. If you injected into your left thigh last time, use your right thigh or your abdomen next. This prevents irritation and helps the medication absorb properly. Some people find it helpful to keep a simple log noting which site they used and when, especially during the loading phase when injections are weekly.
Storage and Handling
Keep Cosentyx in the refrigerator until you’re ready to use it. The 15 to 30 minute warm-up window before injection is fine, but don’t leave the pen sitting out at room temperature for extended periods. Never freeze the medication, and protect it from direct light.
What to Do if You Miss a Dose
If you forget a dose, inject it as soon as you remember. Then contact your prescriber to figure out when your next dose should fall so you can get back on schedule. Don’t double up by giving yourself two doses at once to compensate for the one you missed.
When to Expect Results
Cosentyx doesn’t work overnight. Clinical trials in psoriatic arthritis show meaningful improvements by week 16. In the FUTURE 5 trial, about 55% of people on the 300 mg dose saw complete resolution of enthesitis (painful tendon and ligament inflammation) by that point, and roughly 67% had their dactylitis (swollen “sausage” fingers or toes) fully resolve. For skin symptoms, about 35% of people on 300 mg achieved completely clear skin by week 16, with another 20% reaching near-complete clearance. These improvements held steady through two years of continued treatment.
The loading phase in those first five weeks is designed to build up the drug in your system faster. Even so, most people should expect to wait at least a few months before seeing the full benefit.
Disposing of Used Pens
Place used pens or syringes immediately into a sharps disposal container. These are rigid plastic containers with puncture-resistant lids, available at most pharmacies. If you don’t have one yet, a heavy-duty plastic household container like a laundry detergent jug works as a temporary alternative, as long as it has a tight-fitting lid and won’t leak. When the container is about three-quarters full, follow your local community guidelines for disposal. Many pharmacies, hospitals, and waste management programs accept full sharps containers. Never throw loose pens or needles into your regular trash.
Important Considerations
Cosentyx works by blocking a specific immune signaling molecule involved in inflammation. Because it modifies immune function, it should be used with caution in people who have inflammatory bowel disease or symptoms that suggest it, such as chronic diarrhea, abdominal pain, or bloody stools. Blocking this particular immune pathway can trigger or worsen Crohn’s disease in some people. If you have a personal or family history of inflammatory bowel disease, that’s important information to share with your prescriber before starting treatment.