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Dosage - How long is a 2.5 ml bottle supposed to last when you use 1 drop in each eye per day?

6 Answers

DrakeRPH 7 July 2021

The number of drops per ml of any medication varies depending on the viscosity and density of the solution. Also some manufacturers overfill the bottles to provide extra doses. The prescriber info for Latanoprost solution by Sandoz states that each bottle of 2.5ml contains 24 drops per ml, which is 60 drops The brand name Xalatan by Pfizer is overfilled and contains more than 100 drops per 2.5ml bottle. Studies have been done to analyze the drops per ml, quantity per bottle and cost of use for all manufacturers of latanoprost. Patients will argue that they receive much lower than 20-24 drops per ml. However, a general rule of thumb is 20 drops per ml unless specific info is provided by the manufacturer.

Votes: +0
LatinaCPT 1 Nov 2018

25 days.

Votes: +0
cwcs 14 May 2017

I think it's 2.5 ml in total solution 4 ml, thus 80 drops.

Votes: +1
cwcs 14 May 2017

Oops, it's 4ml bottle, 2.5 solution. Literature does say 80 drops though, so worth checking with manufacturer.

Oddballout89 19 March 2017

There are 20 drops per milliliter. If you have the 2.5ml bottle, that's 50 drops. If you're only using 2 drops per day, it will be a 25 day supply. I'm a CPhT, so I know what I'm talking about.

Votes: +1
BorbitaCarl7 16 Dec 2016

1ml=16drops so 2.5ml is about 37 drops so a 2.5ml will only last about 2 weeks and 3 days.

Votes: +0
d5kolls 28 Feb 2017

You should check the Sandoz pdf drug description that claims the 80 drops per 2.5 ml bottle.

Marvell 3 Aug 2013

More or less 2.5ml of eyedrops, with the usage details you are giving, should last you 15 days.

Votes: +0
BorbitaCarl7 17 Dec 2016

So where do they get the answer that says..the 2.5ml has 90 drops in it??? Please explain..thanks..

d5kolls 28 Feb 2017

Sandoz claims that in the 2.5 ml bottle, there are 80 drops which is nearly 3 months. At one drop a day, the solution should last 80 days NOT 15 days.

Curriegc 6 Nov 2017

If you want the correct answer from a pharmacist. Here it is. 1 ml is 20 drops. So 2.5 is 50 drops. If it's once a day in each eye, then 25 days. The other answers are incorrect. Hope that helps. free discount card

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eye conditions, latanoprost, dosage

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