Morgan Owen, from Buckley, Flintshire, died after being restrained on 5 December. He had also been stunned with a Taser by police two days earlier.
The Independent Police Complaints Commission (IPCC) backed North Wales Police's actions.
An inquest jury concluded the death was accidental through taking cocaine.
The inquest in Abergele, Conwy county, heard Mr Owen, 24, suffered cardiac arrest as a result of taking the drug. He was found to have "toxic" levels of cocaine in his body.
He collapsed shortly after being held by members of the public because he was kicking cars as he made his way along Farm Road.
Police were called and Mr Owen was handcuffed but officers noticed almost immediately he had no pulse and attempts to revive him were unsuccessful.
The inquest focused on the attitude of the officers towards him.
Officers had also been called to other incidents in the days before Mr Owen's death including the one where the Taser was used.
The jury was told of concerns that more was not done to respond to his mental state and questions were raised about whether he was treated appropriately given the behaviour he was demonstrating.
The IPCC investigation looked at a number of complaints from Mr Owen's family about the police handling of the incidents.
It found where police used force, including deploying the Taser, it was necessary and appropriate.
It added police had taken steps to assist Mr Owen's welfare and to protect others and tried along with a member of the public to resuscitate him before paramedics arrived.
IPCC Commissioner Jan Williams said: "Ultimately this was a very sad series of incidents.
"Our investigation found that North Wales Police officers did act in a proportionate and reasonable way in their interactions with Morgan."

Ceredigion council plans to auction the site of former Ysgol Dyffryn Teifi in Llandysul, which closed last term, for development.
The council cabinet meets on Tuesday to discuss the sale set for 30 September.
But a new group, Plant y Dyffryn, wants more time to draw up a bid to buy it.
The site has a price tag of between Â£250,000 and Â£300,000, with proceeds earmarked for the new-build Ysgol Bro Teifi school which opened this month providing education for three to 19-year-olds.
Leah Williams, one of the founders of Plant y Dyffryn, said "any developer could come in and squeeze the community".
She said: "Llandysul is so small and so Welsh it would just tip the balance.
"There are eight acres of land on a large site with plenty of potential," she said.
Plant y Dyffryn is looking at the example of the Cardigan community venture 4CG in order to raise funds to purchase the site, and then run it.
It took over the Pwllhai site in the centre of Cardigan in 2010, and turned it into a car park to generate income from parking fees with buildings and workshops leased out to small businesses.
A public meeting was held on Sunday when Llandysul residents voted to call on Ceredigion council to delay the process of selling the school site.
In response, cabinet member Gareth Lloyd said that if the cabinet delayed the process of selling, then they would consider offering help to the community with their application.
Action taken by police on a soldier who died after being handcuffed during a disturbance was "reasonable and proportionate", an investigation found.
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A group has called on Ceredigion council to delay plans to sell-off a former school site so it can bid to buy and retain it for community use.