He was admitted to Kokilaben Dhirubhai Ambani Hospital in Andheri on July 2.
"Shatrughan Sinha is recovering. He gets breathless occasionally and we have to adjust his medications accordingly. We will keep him under observation. It could take a couple of days, " Dr Ram Narain, Chief Operating Officer of the hospital, told media on Monday.
"Medical examination revealed he had a severe allergic respiratory reaction due to the ongoing painting work in his house. He was brought in Monday afternoon with serious problems in breathing" Narain said.
Chest specialist Dr S P Rai is attending the 66-year-old