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Caffeine works by stimulating the central nervous system (CNS), heart, muscles, and the centers that control blood pressure. Caffeine can raise blood pressure, but might not have this effect in people who use it all the time. Caffeine can also act like a âwater pillâ that increases urine flow.
Cold and flu medicines with decongestants are one of several classes of medication that can raise blood pressure. Others include NSAID pain relievers, steroids, diet pills, birth control pills, and some antidepressants. If you have high blood pressure, ask your doctor if any drugs or supplements you're taking could affect your readings.