One medical doctor says Democratic presidential nominee Hillary Clinton’s use of the blood thinner drug Coumadin is troubling, saying it is “NEVER prescribed to normal, healthy patients.”

Dr. Milton Wolf said via Twitter that he was highly concerned with Hillary’s health, explaining that the blood thinner is not a typical drug, but one that is used on patients who have serious medical conditions.

ANOTHER KEY FACT: #HillarysHealth requires long-term Coumadin blood thinner. This is a big, big deal … particularly for a fall-risk patient. — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

Coumadin is a dangerous drug and NEVER prescribed to normal, healthy patients. Never. It has a significant risk of bleeding. #HillarysHealth — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

There are newer, safer blood thinners than Coumadin. We know one was tried on #HillarysHealth but failed so they went to the big guns. — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

Coumadin is a powerful, dangerous drug. Originally developed as a rat poison. Saves lives but at substantial risk. #HillarysHealth — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

Risks of Coumadin are profound: Spontaneous hemorrhage (intracranial and elsewhere) is very real and relatively common. #HillarysHealth — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

Wolf also said it was troubling that the former Secretary of State’s recent diagnosis of pneumonia, which was covered up by her campaign for two days, does not explain her collapse in public which was caught on camera.

And these still don't explain:

1. Brain blood clots

2. Neurological deficits

3. Long-term Coumadin

4. Today's van episode#HillarysHealth — Dr. Milton Wolf (@MiltonWolfMD) September 11, 2016

He also noted Clinton’s actions were not a “‘faint’ or a ‘stumble.’

“Dehydration/pneumonia does not cause rigidity and spasticity,” according to Wolf.

This is not a "faint" or a "stumble." Dehydration/pneumonia does not cause rigidity and spasticity. #HillarysHealth https://t.co/JWcDjLDnbD — Dr. Milton Wolf (@MiltonWolfMD) September 12, 2016

But this observation was perhaps the most disturbing:

Say a prayer for HC. Brain blood clots w/ residual/recurrent neurological deficits. Stroke until proven otherwise. https://t.co/FyXXrU6wMg — Dr. Milton Wolf (@MiltonWolfMD) September 11, 2016

“Stroke until proven otherwise,” he wrote.