The doctor said the jailed Russian opposition leader risks cardiac arrest and kidney failure after weeks of hunger strike.
A doctor for Russian opposition leader Alexey Navalny, who is on his third week of a hunger strike, said his health was deteriorating rapidly and the 44-year-old Kremlin critic could be on the verge of death.
Dr. Yaroslav Ashikhmin said on Saturday that the test results he received from the Navalny family showed that he had elevated potassium levels, which could cause cardiac arrest, and elevated creatinine levels suggesting kidney failure.
“Our patients can die at any moment,” he said in a Facebook post.
Anastasia Vasilyeva, who heads a Navalny-backed coalition of doctors, said on Twitter that “action must be taken immediately”.
Navalny is the most obvious and tough opponent of Russian President Vladimir Putin.
His personal doctors were not allowed to see him in prison. He hunger-strike to protest refusing to let them visit when he began to experience severe back pain and loss of sensation in his legs.
Navalny said Friday that the prison authorities had threatened to put him in a tight-fitting jacket to force-feed him unless he gave up his hunger strike.
Russia’s state statistics agency says Navalny is getting all the medical help he needs.
Navalny was arrested on January 17 when he was back to Russia is from Germany, which has spent five months recovering from the nerve agent poisoning service he blamed on the Kremlin.
Russian officials have denied any involvement and even questioned whether Navalny was poisoned, it is confirmed by several European laboratories.
He was ordered to serve two and a half years in prison on the grounds that his long recovery in Germany violated a probation he was found guilty of cheating in a case that Navalny said was politically motivated.