A paediatrician was convicted Friday of 16 sex charges stemming from accusations he and his twin brother used their Ohio practice to molest boys and teenagers for over 20 years.

Mark and Scott Blankenburg (53) collectively faced 76 charges of engaging in sex crimes with minors at their practice in the industrial city of Hamilton.

Prosecutors said they slipped money and prescription drugs to the patients after the episodes.

The counts also involve drug trafficking, child pornography, bribery and money laundering.

Mark Blankenburg was tried first and a jury found him guilty of four counts of corrupting a minor, three counts of compelling prostitution, three child pornography counts and six sexual assault counts.

The judge will rule on the 25 remaining counts, a court spokesperson said.

The alleged incidents remained secret for years and only emerged following a two-year investigation into allegations that Blankenburg was providing improper prescriptions to minors.

Authorities found what they called "child erotica" at the home shared by the twin pediatricians, who were known to take photographs at a local high school's athletic events.

Scott Blankenburg is scheduled to be tried in April.