Can I keep it at room temperature?

Unmixed powder, often yes for a period. Reconstituted liquid, no as a default. Follow the supplier's instructions for the specific compound.

My fridge froze it. Is it fine?

Assume not. Freezing is the one storage error likely to have caused damage, and there is no way to check by looking.

How do I stop it rolling around the fridge?

Keep them in a small box or the travel case, so they stay upright and dark and nobody knocks them reaching for the milk.

Storage4 min read

Storing it properly

Unmixed powder keeps in the fridge, or at room temperature away from light for shorter periods, depending on what it is. Once reconstituted, the fridge at 2 to 8°C is the default. Never the freezer, and never the fridge door.

Storage requirements are a property of the compound, and the supplier's own instructions always take priority over general advice. What follows is equipment and handling guidance.

Before mixing

Sealed powder is far hardier than the liquid it becomes. Kept cool, dry and out of light in its original vial, it is a low-maintenance thing. The specifics vary, so follow whatever the supplier states.

After mixing

The fridge, between 2 and 8°C. Practically that means the middle of a shelf, towards the back, and not the door. The door swings through room temperature every time someone fetches the milk, and a vial living there is temperature-cycled several times a day.

Middle shelf, towards the back
Upright, in a small box so it cannot roll or get knocked
Out of direct light, which the box handles
Not touching the back wall, where things occasionally freeze
Labelled with the date you mixed it

Never the freezer

Freezing reconstituted liquid forms ice crystals that damage the molecules you were trying to preserve. If something has been frozen accidentally, thawing it does not undo that.

Filled cartridges

Same rules as a mixed vial. Upright, cold, dark. The travel case holds cartridges in foam channels, which covers all three.

Take it out fifteen minutes before injecting. Cold liquid stings, and that is easily avoided.

Questions

Can I keep it at room temperature?: Unmixed powder, often yes for a period. Reconstituted liquid, no as a default. Follow the supplier's instructions for the specific compound.
My fridge froze it. Is it fine?: Assume not. Freezing is the one storage error likely to have caused damage, and there is no way to check by looking.
How do I stop it rolling around the fridge?: Keep them in a small box or the travel case, so they stay upright and dark and nobody knocks them reaching for the milk.