(CNN) Sen. Bernie Sanders is in "good health," nearly three months after suffering a heart attack, the attending physician at the US Capitol said in a letter released Monday.

The physician, Brian Monahan, said in a summary of the Vermont senator's health that Sanders is no longer taking several of the medications initially prescribed to him after the heart attack.

"Several of the medications you initially required (blood-thinner, beta blocker) were stopped based on your progress," Monahan wrote. "Your heart muscle strength has improved. You have never had symptoms of congestive heart failure. The heart chamber sizes, wall thickness, estimated pressures, and heart valves are normal. Several 24-hour recordings of your heart electrical activity indicated no significant heat rhythm abnormality."

Later in the letter, Monahan said: "You are in good health currently and you have been engaging vigorously in the rigors of your campaign, travel, and other scheduled activities without any limitation."

Monahan's letter notes that the 78-year-old Sanders is 6 feet tall and weighs 174 pounds.

Read More