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Author: Admin | 2025-04-28
– including amphetamines, which are chemically-similar to phentermine ( 11 ). So, speak with your doctor about this possible risk before starting phentermine.Go to the hospital immediately if you feel pain in your chest, left arm, jaw, or back or have other heart attack-like symptoms while taking phentermine.Other Effects of Phentermine on the HeartSerious phentermine heart problems are always possible, and very serious, but not as common as other phentermine effects on the heart, such as racing pulse, increased blood pressure, and irregular heartbeat.In fact, almost 1 in 4 phentermine users reported some type of heart or blood pressure problem while taking this medication ( 12 ).A doctor will monitor your heart rate and rhythm during treatment with phenterminePhentermine and Heart RateIncreased blood pressure and tachycardia (fast heart rate) are listed side effects of phentermine ( 5 ).A normal heart rate is 60-100 beats per minute, while optimal is blood pressure is around 120/80 mm Hg for the average adult ( 13 ).However, stimulant medications like phentermine can raise heart rate and blood pressure well above normal ranges. The pills’ effect on the heart are part of the reason that phentermine is not suitable for patients with cardiovascular disease or uncontrolled high blood pressure.Interestingly, some recent research indicates that phentermine does not significantly increase heart rate or blood pressure when taken as prescribed ( 14 ).Therefore, it is critical that the prescribing physician monitor heart rate and blood pressure throughout treatment. For some patients, it may also be beneficial to monitor heart rate and blood pressure at home between appointments.Seek immediate medical attention if you show any signs of abnormally high heart rate or blood pressure while taking phentermine.Phentermine and Heart PalpitationsHeart palpitations are another potential side effect of phentermine weight loss pills ( 5 ). A heart palpitation is when it feels like your heart is pounding, fluttering or skipping a beat.Phentermine heart palpitations occur because, as a stimulant, this drug makes your heart more sensitive to electrical signals and may cause it to beat slightly outside of its normal rhythm. However, these palpitations may also indicate a more serious problem and can prove dangerous if not corrected.Call your doctor or seek medical attention right away if you feel like your heart is pounding, fluttering, or beating irregularly while taking this medication.Signs of Phentermine Heart ProblemsCall your doctor or go to the hospital IMMEDIATELY if you suspect a phentermine heart problem or notice any of the following symptoms ( 15 , 16 ):Shortness of breath, even with only mild exertionChest painLightheadedness or faintnessSwelling in your legs, ankles, or feet (edema)Pounding or irregular heartbeat, or fluttering in your chestSlurred speech or weakness on one side of your bodyUnusual thoughts or behavior, such as confusion, irritability, rage, or hallucinationsExtreme happiness or sadnessSymptoms of dangerously high blood pressure, such as severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats, or seizures.These symptoms can indicate a serious phentermine side effect. Seek professional medical attention immediately
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