Household tips

A lot of tablets use lactose as a filler, could be the active ingredient or could just be china clay which is very good at absorbing stuff.

 

Lactose is a milk sugar and will caramelise on a hot iron.
One thing to be aware of is that different brands of generic medicines have different additives as well as the active ingredients. These additives are often chosen on cost and to make that brand distinctive.
A colleague of mine was on routine medication for a chronic problem and one prescription the pharmacy gave him a different brand that was a different colour. He had the "trots" the whole time he was on this different brand. Eventually worked out that it was the yellow dye in the capsule. GP was worse than useless, but he was able to convince the pharmacy and they got him a supply of the previous brand and problem disappeared.
If you are lactose intolerant then check the ingredients list carefully.