Cetrotide (cetrorelix) should be stored in the refrigerator at 2 to 8°C (36 to 46°F), according to the FDA-approved labeling. The manufacturer’s guidance allows the 0.25 mg formulation to remain at room temperature, not exceeding 25°C (77°F), for up to 3 months as long as it stays in its original packaging and is protected from light. Beyond that window, the medication should not be used.
Standard Refrigeration Requirements
The recommended storage for Cetrotide 0.25 mg is refrigeration between 2 and 8°C (36 and 46°F). The packaged tray should stay inside its outer carton, because the medication is sensitive to light. This means you shouldn’t remove individual syringes or vials and leave them loose in the fridge door or on a counter where they’re exposed to ambient light for extended periods.
Room Temperature Limits
If Cetrotide has been left out of the fridge, the key factor is temperature. Room temperature in pharmaceutical terms means no higher than 25°C (77°F). At or below that threshold, the medication remains stable for up to 3 months from the date it left refrigeration, provided it hasn’t passed its printed expiration date. If your home runs warmer than 77°F, particularly during summer or if you don’t have air conditioning, the stability window shortens and the medication may degrade faster than expected.
Once Cetrotide has been stored at room temperature, don’t put it back in the fridge and restart the clock. Track when it first came out of refrigeration and use it within that 3-month period.
After Mixing With the Solvent
The room temperature guidance applies to the unmixed powder and solvent in their sealed packaging. Once you reconstitute Cetrotide by mixing the powder with the pre-filled solvent syringe, the stability changes significantly. The mixed solution should be injected promptly. It is not meant to be stored, refrigerated or otherwise, after reconstitution.
Before injecting, check the solution carefully. It should be completely clear and free of visible particles. If it looks cloudy, lumpy, discolored, or contains floating particles or sediment, do not use it. These are signs the medication has degraded or was not properly dissolved.
What If It Was Left Out Overnight
A single night at normal room temperature is well within the allowable window and poses no issue for the unmixed medication. If you accidentally left Cetrotide on the counter overnight and your home stayed below 77°F, the medication is fine to use. The concern would be if it sat for hours in a hot car, near a heat source, or in direct sunlight, any of which could push the temperature well above the stability threshold.
If you’re unsure whether the medication was exposed to heat, look at the powder inside the vial. It should appear uniform and white. Any visible changes in color or texture are a reason to contact your pharmacy for a replacement.
Traveling With Cetrotide
For travel, pack Cetrotide in an insulated bag or small cooler with a freezer pack. Freezer packs are exempt from TSA liquid volume regulations, so you can bring them through airport security alongside your medication. If you’re driving, a larger cooler with ice works, but keep the medication in a waterproof case so melting ice doesn’t reach the packaging. Avoid storing it in the trunk or glove compartment, where temperatures can spike quickly.
When flying, carry the medication in your carry-on bag rather than checking it. Cargo holds can experience temperature extremes that fall outside both the refrigerated and room temperature ranges.
Protecting From Light
Light protection matters as much as temperature. The FDA labeling specifically instructs patients to keep the packaged tray inside the outer carton at all times until you’re ready to use it. If you’ve removed a vial or syringe from the carton for any reason, return it as soon as possible. Prolonged light exposure can break down the active compound even if the temperature is within range.