Piers Morgan has said that his dad has been taking hydroxychloroquine for rheumatoid arthritis over the last six years.
It is the same drug that Trump controversially said that he was using to prevent contracting coronavirus.
Dr Hilary yesterday slammed Trump for promoting the use of the unproven drug, which he said could be "very toxic" and listed the dangerous potential side effects.
And while Piers also slammed the US President, he also insisted that he didn't want to put people off using the drug for malaria, lupus and rheumatoid arthritis.
He said: "I was speaking to my parents last night and my dad suddenly pipes up because he's been on hydroxychloroquine.
"So my dad had a few outbursts of rheumatoid arthritis and he got put on this hydroxychloroquine for that, and he's been really good with it.
"Six years he's been on it, and he's not had an attack of the arthritis ever since. It's interesting, isn't it. We don't want to tell people who should be on it that because Donald Trump is taking it irrationally and wrongly for covid-19, where it appears to have no effect.
"We don't want people who have Lupus or malaria or in my father's case rheumatoid arthritis... because it's a very effective drug when used properly for things it's supposed to be treating."
Yesterday, Dr Hilary suggested that Trump "sounded like a drug pusher" by telling US citizens that they "might like" the drugs.
Listing the drug's potential harmful effects, he said: "It can cause heart failure, very toxic to the liver so therefore there are no benefits shown in the clinical trials [in relation to coronavirus]. In fact, it could be dangerous."
"It's quite a toxic drug, it needs to be used very carefully," Dr Hilary continued. "But there is no proven evidence."
*Good Morning Britain airs weekdays at 6am on ITV
