94% through the urine, 6% through feces

98-99%

40-60%

B (US)

A (Australia)

Various cytochrome P450 liver enzymes: CYP2D6 (80%), 3A4 (10%)

8 hours (children)
9 to 12 hours (adults)
17 hours (elderly)

Over the counter

Oral, parenteral (IM), parenteral (IV), topical, suppository