Methamphetamine at one time was available in pill form as a prescription drug.It was used as a diet pill and as an early treatment for ADHD.
What you are describing sounds more like a high potency opioid tablet being used a bit at a time for smoking, snorting, or injecting. It would almost have to be a street tablet as nearly all of the pharmaceutical high potency opioids are now being manufactured so that if crushed or broken, they turn into a plasticky gel. The exemption to this is Roxicodone, a straight oxycodone tablet manufactured in different potencies. It is extremely popular on the street because it contains neither the anti-abuse stuff, nor acetaminophen (called APAP by pharmacists), which your typical oxycodone tablets from the pharmacy (generic Percocet) do, and which is toxic to the liver in lower dosages than you'd think.
Other possibilites are Dilaudid (or street version) which doesn't contain additives, provides a short, but intense high ( especially if injected).
The huge risk is that street opioids are now being very frequently cut with Fentanyl or one of its analogs. This is the reason for the huge increase in ODs we hear so much about. Fentanyl and its relatives are extremely potent, so much so that in some cases, Narcan can't blockade the drug in higher doses.