Prosecutors say the drugs sold by 41-year-old John Lee of Walnut were dangerous black-market creations falsely advertised as herbal remedies and some customers suffered permanent injuries.
Lee also was ordered Monday to pay $550,000 in restitution to victims.
Manufactured 5.5 Million Pills
Prosecutors say from 2011 to 2017, Lee illegally imported powdered tadalafil — the active ingredient in the prescription drug Cialis.
Lee made 5 ½ million pills, some containing 14 times the level of the drug found in Cialis.
He pleaded guilty in February. More than a dozen other associates and companies have pleaded guilty to conspiring with Lee.