Referred to as 'Big Brother' or 'Xiguang' in Chinese media reports, the elephant was captured in 2005 in southwest China by illegal traders who fed him heroin-laced bananas.
The traders used the spiked bananas for several months to control him before they were arrested by police.
Xiguang was released back into the wild but was soon sent to animal protection center after his behavior appeared to suggest he was suffering withdrawal symptoms from heroin, Xinhua news agency reported.
A year of methadone injections at five times the human dosage helped wean the elephant off heroin.
Gradually, the dosage was reduced until he was completely weaned off the drug.
Now clean, Xiguang is expected to move to a wildlife park in Kunming - the capital of the elephant's home province of Yunnan on the mainland.