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:
A presidential pardon may be granted at any time, however, and as when Ford pardoned Nixon, the pardoned person need not yet have been convicted or even formally charged with a crime. Clemency may also be granted without the filing of a formal request and even if the intended recipient has no desire to be pardoned.