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:
Washington, Sept. 8--President Ford granted former President Richard M. Nixon an unconditional pardon today for all Federal crimes that he committed or may have committed or taken part in while in office, an act Mr. Ford said was intended to spare Mr. Nixon and the nation further punishment in the Watergate scandals.