Only 2 pills in any twelve-hour period, they're very toxic

Sounds like the drugs they advertise on TV today, with side effects such as:
Nausea, vomiting, headaches, dizziness, numbness, tingling of the extremities, blurred vision, confusion, rapid heart rate, stroke, cardiac arrest, liver damage, respiratory failure, kidney damage, paralysis, brain hemorrhoid, genital insanity and psychosis of the liver.