Boyzone turned to alcohol after Stephen Gately died.
The 'Love Me For a Reason' hitmakers were left distraught when their bandmate died suddenly from an undiagnosed heart condition five years ago aged 33, and they subsequently underwent their "worst" ever tour.
"When he died we were contractually obliged to go on tour. We were grieving hugely and unfortunately the therapy we turned to on that tour was alcohol which was totally the wrong thing to do," Mikey Graham said.
"It's the worst tour we've ever done. Alcohol stayed with us for quite some time even after the tour. It became a habit," Ronan added.
Thankfully the quartet eventually found healthier ways to cope and adjust to their loss.
"We were using alcohol to numb the pain. I was drinking way too much, upsetting the people I love most and having awful nightmares so I went for bereavement counselling,” Keith Duffy said.
"I talked about my grief and the whole drinking problem and I gave up drinking for the whole of 2011. Saying your problems out loud helps you resolve your issues."
"I read a lot of self-help books but I don't think it cured me," Mikey then said.
"I fixed myself. My mind is very strong but everyone is different," Shane Lynch added to OK! magazine.
"I've had counselling over the years and it's been wonderful," Ronan admitted.
So finally it's time to make my west end Debut on @OnceMusicalLDN thank you everyone that helped me get this far. Steo this ones for you. X
— Ronan Keating (@ronanofficial) November 17, 2014