Yes they do.
But you know how much tadalafil is in one pill - 20mg.
So, if you want 5mg, that's a quarter of that.
Whatever 20mg pill you have, you weigh one. Mine are about 0.348 grams.
Then for a quarter, divide by 4 - with a calculator (most PCs have one in "Accessories" or you can even do a calculation by typing it in Google.com).
In my case, that is 0.087 grams for a quarter of a pill (5gm of tadalafil). So, if I split the weird shaped pills and the pieces are 0.12 and 0.05 grams, I know they are way too big and too small. What I am probably going to do is crush those and weigh out 0.087 gram amounts of the crushed pills on the scale.
The scale (linked in the previous post) actually weights that finely - it is made for stuff like gems where tiny fractions of weight can make a difference.
So, the first step is always to weigh one whole pill, then you know how much 20mg weighs.
Is that scale good enough for "compounding" your own low dose anastrozole? I've read about guys who grind up a 1mg anastrozole, mix it with a binder like calcium carbonate or something similar, and then dividing it up to the dose that they want.