Flowers stepped down as Co-op Bank chairman in June last year after reported claims of illegal drug use and concerns about his expenses.
The 63-year-old also resigned as a Methodist church minister days before his arrest in November, following newspaper allegations that he was involved in a drug deal.
Flowers was charged with two offences of possession of Class A drugs -- considered the most harmful category -- namely cocaine and methamphetamine.
He was also charged with one count of possession of ketamine, a drug in the lowest category, Class C.
He was charged after he answered bail at a police station in the Yorkshire city.