Calculating the strength of mixtures
Most topical drugs are applied at a rate of 1% to 5% of the liquid mixture unless they are irritating like Retin-A.
You can assume that 1ml of liquid is 1g in weight. It is very simple to calculate the strengths of topical mixtures.
One gram (1gm) of solid mixed into 100ml of liquid is a 1% solution.
In other words 5% minox is 60ml of liquid and 3 grams of minoxidil.
How many 10mg tablets would be needed to make a 1% solution?
| A 1% solution means 1g/100 mL or .6g/60ml: | .01 = 1 / 100 |
| .01 - .6 / 60 | |
| grams = 60 * .01 | |
| .6 = 60 * .01 | |
| total mg needed = .6 * 1000 | |
| tablets = (.6 * 1000) / amount in each | |
| tablets = 600 / 10mg | |
| tablets = 60 |