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High & Low Blood Pressure board

Also, fire stations will check you bp for free also and I don't know about where you live, but the firemen here are CUTE!
Stay away from any cold medicines that have decongestants in them. Take antihistimines instead.
Nyquil, Sudafed and cough medicines are big no-nos and will raise your blood pressure. Anything with "D" on it, don't take.
Take Claritan, Alavert or generic Loradine which won't work as great as decogs, but will help especially during allergy season.
I also agree with Fam, don't trust bp machines at grocery stores and drug stores. Buy yourself one and you can get one for $40. Its well worth the investment.