The broadcasting watchdog ruled in its investigation that the pre-watershed episode that aired in February did not breach its guidelines.
The scene saw gay vicar Billy Mayhew, played by Daniel Brocklebank, taking heroin in a church alongside his brother Lee, played by Richard Crehan.
After taking the Class A drug, Lee told Billy: “This must be what heaven feels like.”
After the controversial scene received backlash from viewers, an ITV spokeswoman said: “Coronation Street has a strong tradition of tackling serious contemporary issues in a responsible way.
“In upcoming episodes we will be showing the very negative side of drug taking as Billy’s life starts to fall apart.”
The spokeswoman added that the storyline was researched thoroughly with the help of Addaction – a British charity that supports people with alcohol and drug addictions.
The soap has split its fans opinions recently with a number of dark and serious issues its storylines have been covering.
Viewers recently saw Pat Phelan go on the run following a string of gruesome murders he has yet to be punished for and last month viewers saw David Platt was raped by a man he believed to be his close friend.
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Woman to Woman LORRAINE JONES is a Christian minister whose son was stabbed to death. She shared the story with Maria Rodrigues and issued a challenge to the church in the UK to get out on the streets to pray.