Botox (onabotulinumtoxinA) is a prescription medicine that must be stored and prepared according to its exact product label. In the United States, unopened Botox vials are refrigerated at 2°C to 8°C (36°F to 46°F). After a clinician mixes the powder with sterile saline, the solution must stay refrigerated and be used within 24 hours. Vials are single-use, and trained healthcare professionals should handle and inject the medicine.
How Should Unopened Botox Be Stored?
Botox is supplied as a vacuum-dried powder in a vial. Before it is mixed for an injection, the vial must be kept refrigerated under the temperature conditions specified by the manufacturer. The U.S. National Library of Medicine's DailyMed prescribing information for BOTOX specifies refrigeration at 2°C to 8°C (36°F to 46°F) for unopened vials.
The printed expiration date on the vial must be followed. Keep the product identifiable so healthcare staff can check its name, packaging, and expiration information before use. Do not use an expired vial or assume that a product is suitable for injection simply because its packaging looks normal.
How Should Botox Be Stored After Mixing?
Before injection, a trained healthcare professional reconstitutes the powder by adding the specified liquid. For BOTOX and BOTOX Cosmetic in the United States, the prescribing information directs clinicians to use sterile, preservative-free 0.9% sodium chloride injection. The amount of liquid must match the instructions for the specific product and intended treatment.
According to the U.S. National Library of Medicine's BOTOX Cosmetic prescribing information, the reconstituted solution must be refrigerated at 2°C to 8°C (36°F to 46°F) and administered within 24 hours. The label also states that the reconstituted product must not be frozen. The date and time of mixing should be recorded so the permitted use period can be tracked accurately.
These instructions are specific to the product. Different botulinum toxin brands and formulations may have different preparation and storage requirements. A clinic should always follow the exact prescribing information for the product it uses rather than applying one brand's instructions to another.
How Is Botox Properly Prepared and Checked Before an Injection?
Storage is only one part of safe handling. The person preparing Botox must use the specified diluent, follow the product's preparation instructions, and work with sterile injection equipment. For example, the BOTOX prescribing information directs clinicians to gently mix the product by rotating the vial and to discard the vial if the expected vacuum does not draw the diluent into it.
The solution should also be inspected before administration. The BOTOX label describes the reconstituted solution as clear, colorless, and free of visible particles. BOTOX Cosmetic should be clear and free of particles, with the color described in its label as colorless to slightly yellow. A solution that is cloudy, discolored, or contains flakes or particles should not be used. Visual inspection does not replace correct storage, proper preparation, or checks of the product's identity and expiration date.
Why Are Single-Use Vials and Clean Handling Important?
Botox vials are labeled for single-dose use. Any unused portion must be discarded rather than saved for a later appointment. Keeping leftover medicine may create problems with contamination and does not extend the product's approved period of use.
The U.S. Centers for Disease Control and Prevention (CDC), in its guidance on safe injection practices, advises healthcare professionals not to use single-dose vials for multiple patients or retain leftover contents for later use. Needles and syringes must be sterile and used only once. These precautions help prevent germs from entering medication or being transmitted between patients.
What If Botox Has Been Left Out, Frozen, or Stored at the Wrong Temperature?
Botox should be kept within the temperature range stated in its product information. If a vial has been left at room temperature, exposed to excessive heat, or accidentally frozen, do not assume that putting it back in the refrigerator makes it suitable for injection. The effect of a temperature excursion depends on the product and the circumstances, including how long it was exposed and the temperature reached.
The clinic's pharmacist or other responsible healthcare professional should check the manufacturer's instructions and obtain product-specific guidance before the vial is used. If the product's storage history cannot be established, its suitability should not be guessed. Do not use an expired vial or a product whose storage conditions cannot be verified.
The U.S. Food and Drug Administration (FDA) explains that a medicine's expiration date reflects the period during which its strength, quality, and purity are supported when it is stored under the labeled conditions. Improper storage or degradation may reduce the intended benefit, and a product's appearance alone cannot establish that it has remained within its approved storage conditions.
How Can Patients Check That Botox Has Been Handled Safely?
Patients do not need to store or prepare Botox themselves. The clinic or healthcare facility is responsible for obtaining the product through an appropriate supply chain and following its storage and handling instructions. Before treatment, patients can ask which product will be used, whether it was obtained from an authorized source, and whether it has been stored according to the manufacturer's requirements.
The FDA's November 2025 warning about illegally marketed botulinum toxin products notes that products obtained from unauthorized sources may be counterfeit, contaminated, improperly stored, or otherwise unsafe. Botox is a prescription medicine, not a product for self-injection. Avoid buying injectable toxin products from unverified online sellers or attempting to mix and inject them without appropriate professional training.
Key Storage Rules to Remember
For Botox treatments, correct storage begins with the unopened vial and continues through preparation and administration. The main practical points are to follow the product-specific temperature range, check the expiration date, use the correct diluent, record when the vial is mixed, observe the permitted use period, inspect the solution, and discard unused contents from a single-dose vial. If there is any doubt about a product's identity, storage history, or condition, the healthcare professional responsible for the treatment should resolve it before use.