Test results showed the presence of prohibited stimulants (phenylpropanolamine, norpseudoephedrine and ephedrine) in Fukuda's system.
Fukuda (19-7) was released from his contract after losing a decision to Brad Tavares. The 32-year-old Japanese mixed martial artist was 2-3 inside the Octagon.
Caceres, meanwhile, remains with the organization following a positive test for marijuana metabolites.
Caceres issued the following statement on Thursday:
"I accept full responsibility for my actions and the consequences from those actions. I apologize to all that I have disappointed, including the UFC, my family, coaches, training partners and fans.
"I accept the sanctions from the UFC and I look forward to completing the necessary steps to getting back in the Octagon following the suspension and assuring that this never happens again."
The 24-year-old Floridian will attend drug rehabilitation classes and serve a six-month suspension retroactive to the date of the event. Caceres (8-5) is required to pass a drug test upon completion of his suspension before being cleared to compete. A decision win over Kyung Ho Kang, the third straight victory for Caceres, will instead be registered as a no-contest.
All 22 fighters on the UFC on Fuel TV 8 card were drug tested.