What does preservative-free mean on eye drops?

It means exactly what it says: the formula contains no preservative. Quell is preservative-free, and because its label lists every ingredient, you can confirm that yourself instead of taking the front of the box on trust.

What a preservative does in an eye drop

A preservative is an ingredient added to stop microbes growing in a solution that will be opened and used over weeks. Plenty of multi-use eye drops contain one. Benzalkonium chloride is a common example, and it shows up in the inactive ingredients of many drops that do use a preservative.

Why some people look for drops without one

Preservatives such as benzalkonium chloride are a common source of irritation for people using drops several times a day. Preservative-free drops exist as a category mainly for that reason, and it is why Quell leaves them out entirely.

Frequency is the point. Quell’s directions call for use every day: Apply 1 drop 3 times per day in each eye. An ingredient you might never notice in an occasional drop is one your eyes meet six times a day at that rate, which is why people who use drops on a schedule tend to read the inactive list more carefully than anyone.

How to check a label yourself

Go to the Drug Facts panel and find the Inactive ingredients section. It lists everything in the bottle that isn’t an active ingredient, and a preservative would appear there. Quell’s reads: Caprylyl Glycol, Dead Sea Salt (Sodium Chloride), Emu Oil, Glyceryl Laurate, Glyceryl Undecylenate, Manuka Honey, Polaxamer 188, Sterile Water, Terminalia Chubula and Tromethamine.

You can read that list yourself, or take it to a pharmacist if you want a second opinion on any ingredient in it. The front of a carton tells you what a maker wants you to notice first; the panel is the full account, and it is the part to rely on if the two ever seem to disagree.

Preservative-free still needs care

A solution with no preservative needs the same sensible handling as any other drop. Quell’s When using section says: Do not touch tip of bottle to any surface to avoid contamination. The home page spells out that this includes your eye and your fingers.

The label also gives one reason not to use a bottle at all. Its Do not use line reads: If this product changes color. The drop is milky brown when it is right, so the thing to watch for is a change from how it looked when it arrived.

And storage matters: Store between 15° to 30°C (59° to 86°F). Following those instructions is part of using any eye drop, preserved or not.

If your eyes are sensitive

If you have reacted to an eye drop before, or you use several products, the most useful thing you can do is bring the labels to your eye doctor or pharmacist and ask which ingredients to avoid. Quell’s label adds one specific caution to know before you order: Caution should be used in those with egg or bird allergies — For use in the eyes only.

What preservative-free doesn’t tell you

It describes one thing a formula leaves out. It says nothing about what the drop is for, which is the job of the Uses section. For Quell, that reads: For use as a protectant against further irritation or to relieve dryness of the eye.

For the rest of the panel, see how to read a Drug Facts label. For more on the preservative this formula leaves out, the guide to benzalkonium chloride covers it, and the full panel is always one click away.