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 president or governor may grant a full (unconditional) pardon or a conditional pardon. The granting of an unconditional pardon fully restores an individual's civil rights forfeited upon conviction of a crime and restores the person's innocence as though he or she had never committed a crime.