Medications might also cause a drop in blood pressure. Beta-blockers and nitroglycerin, used to treat heart disease, are common culprits. Diuretics, tricyclic antidepressants, and erectile dysfunction drugs can also cause hypotension. Some people have low blood pressure for unknown reasons.
Theoretically, then, the President can probably pardon him/her-self for any Federal crime â but this only prevents actual prosecution for that crime, not impeachment for the crime itself. Prior Answer, to the hypothetical of the VP murdering the President and then pardoning himself:
Presidential Clemency: Pardons, Commutations, and Reprieves. The United States Constitution gives the President of the United States the power of executive clemency, which includes the ability to pardon a person convicted of a federal offense. (Article II, Section 2.) State governors have the power to pardon state convictions.