Michael Douglas is getting candid about his son Cameron's public struggle with drug addiction.
Cameron was released from jail in August 2016 after serving almost seven years for drug charges. He was originally sentenced to five years in prison for possession of heroin and selling methamphetamine in 2010, but after admitting to smuggling drugs into prison, his sentence was extended.
"My son’s struggle was a nightmare," Douglas says in a new interview with Radio Times (via The Daily Mail). "It was stressful for all involved, very painful and difficult. I’m happy to say he’s in wonderful shape now."
Cameron -- whose mother is Douglas' first wife, Diandra Luker -- welcomed his first child with girlfriend Viviane Thibes, daughter Lua, this past December.
Michael Douglas and son Cameron Douglas
Michael Douglas and son Cameron Douglas
HOLLYWOOD, CA - JUNE 25: Actor Michael Douglas and son Cameron Douglas arrive for the Premiere Of Disney And Marvel's 'Ant-Man And The Wasp' held at the El Capitan Theater on June 25, 2018 in Hollywood, California. (Photo by Albert L. Ortega/Getty Images)
Actor Michael Douglas (L) and Cameron Douglas attend the World Premiere of Marvel Studios 'Ant-Man and The Wasp' at the El Capitan Theater, on June 25, 2018, in Hollywood, California. (Photo by Valerie MACON / AFP) (Photo credit should read VALERIE MACON/AFP/Getty Images)
LOS ANGELES, CA - JUNE 20: Michael Douglas and his son, Cameron Douglas are seen on June 20, 2018 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
LOS ANGELES, CA - NOVEMBER 09: (L-R) Michael Douglas, Catherine Zeta-Jones and Cameron Douglas attend the Los Angeles Mission Legacy of Vision Gala at Four Seasons Hotel Los Angeles at Beverly Hills on November 9, 2017 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
404806 04: Actor Michael Douglas (R) and his son Cameron Douglas arrive at the Conde Nast Traveler Hot List party at the W Hotel May 1, 2002 in New York City. (Photo by Mark Mainz/Getty Images)
Kirk Douglas, Anne Douglas, Diandra Douglas, Cameron Douglas, and Michael Douglas (Photo by Ron Galella, Ltd./WireImage)
Michael Douglas, Cameron Douglas, and Diandra Douglas (Photo by Ron Galella/WireImage)
Michael & Cameron Douglas during Holyfield v. Tyson II in Las Vegas, Nevada, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
UNITED STATES - MAY 26: Diana Douglas Darrid with her grandson Cameron Douglas (l.) and her son Michael Douglas (r.) attending book party for Darrid's 'In The Wings: A Memoir' at Sardi's. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - MARCH 15: Actors Lou Gossett Jr., Michael Douglas and son Cameron Douglas (l. to r.) watch as the New Jersey Nets defeat the Miami Heat, 97-78, at the Continental Airlines Arena. (Photo by Howard Earl Simmons/NY Daily News Archive via Getty Images)
Michael Douglas, mother, and son Cameron Douglas (Photo by Jim Smeal/WireImage)
NEW YORK - DECEMBER 17: (ITALY OUT) Cameron, Kirk and Michael Douglas stand in front of Cipriani's Restaurant December 17, 2002 in New York City, New York. (Photo by Arnaldo Magnani/Getty Images)
LOS ANGELES - APRIL 7: Actor/producer Michael Douglas (L) and son actor Cameron Douglas arrive at the premiere of 'It Runs In The Family' at the Bruin Theater on April 7, 2003 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
NEW YORK - APRIL 13: (U.S. TABS & HOLLYWOOD REPORTER OUT) (L to R) Diana Douglas, Kirk Douglas, Michael Douglas and Cameron Douglas arrive at the New York premiere of 'It Runs In The Family' at the Loews Lincoln Square Theater April 13, 2003 in New York City. (Photo by Scott Gries/Getty Images)
Cameron Douglas and Michael Douglas (Photo by Mark Sullivan/WireImage)
PROVIDENCIALES TURKS AND CAICOS ISLANDS, BWI- JANUARY 05: ***PREMIUM PRICING;USAGE IN POSITIVE STORY ONLY;GETTY IMAGES EXCLUSIVE;TABLOIDS OUT*** Actor Michael Douglas, actress Catherine Zeta-Jones with Cameron Douglas and his girlfirend Kelly Sotton Dellis Cay on Turk and Caicos while on holiday in the Caribean January 5, 2007 in Providenciales Turks and Caicos Islands. (Photo by Frazer Harrison/Getty Images).
CULVER CITY, CA - MARCH 06: Cameron Douglas, actor Michael Douglas and actress Catherine Zeta-Jones attend Kirk Douglas' one man show 'Before I Forget' at The Kirk Douglas Theatre on March 6, 2009 in Culver City, California. (Photo by Jason LaVeris/FilmMagic)
April 27, 2009 Hollywood, Ca.; Cameron Douglas and Michael Douglas; 'Ghosts of Girlfriends Past' World Premiere; Held at Grauman's Chinese Theatre (Photo by Gregg DeGuire/FilmMagic)
Actor Michael Douglas and Cameron Douglas attend a performance of Hairspray on October 23, 2002 at the Neil Simon Theater in New York City. (Photo by Ron Galella, Ltd./WireImage)
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"He’s been out of federal prison a year and a half and he’s actively pursuing his career," Douglas adds of Cameron's new path.
Last month, ET spoke with both the 73-year-old actor and his 39-year-old son at the Ant-Man and the Wasp premiere, where they talked about fatherhood.
"Lua is the most beautiful little girl," Douglas gushed. "I couldn't be more happy, and it's just great to see him be such a great father."