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:
Andrew Johnson. Democratic President Andrew Johnson pardoned about 7,000 people in the over $20,000 class by May 4, 1866. More than 600 prominent North Carolinians were pardoned just before the election of 1865. President Andrew Johnson pardoned, commuted or rescinded the convictions of 654 people.