Yes, phentermine can be bad for the heart, especially for individuals with pre-existing heart conditions, as it can increase blood pressure and heart rate, potentially causing palpitations, arrhythmias, or even rare but serious issues like pulmonary hypertension and heart valve damage. Doctors generally avoid prescribing it for people with heart disease, high blood pressure, or glaucoma, but it's sometimes used in combination with other medications (like topiramate) for weight loss, with studies showing mixed results on major cardiovascular events.
Rare but serious phentermine side effects include:
Dangerously high blood pressure or heart rate. Pulmonary hypertension (a rare lung condition) Damage to the heart valves.
Other antidepressants may be taken with phentermine as long as your prescriber OKs it. These include: Selective serotonin reuptake inhibitors (SSRIs) such as sertraline (Zoloft) Serotonin and norepinephrine reuptake inhibitors (SNRIs) such as venlafaxine (Effexor XR)
A link may exist between phentermine and heart failure. There are rare reports of valvular heart disease in people who have taken phentermine, and it may also cause pulmonary hypertension. Valvular heart disease involves damage to one or more of the valves in the heart.
Interactions between your drugs
There were no interactions found between phentermine and prednisone. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.
What may interact with this medication?
Ozempic leads to greater weight loss (15-20% of body weight) compared to phentermine (5-10% in the short term), but phentermine may work faster initially. Phentermine is typically prescribed for short-term use (up to 12 weeks), while Ozempic/Wegovy is approved for long-term weight management.
Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately: increased blood pressure. heart palpitations.
Yes, a weak heart can often become stronger or significantly improve with consistent effort, involving a doctor-guided plan with regular exercise, a heart-healthy diet (low sodium), medications, stress management, quitting smoking, limiting alcohol, and managing other conditions like high blood pressure or diabetes to improve heart function and quality of life.
Phentermine is a sympathomimetic agent. Sympathomimetic agents have been linked to hypertension. Complications of phentermine include ischemic stroke and hemorrhagic stroke.
Phentermine combined with SSRI drugs, such as Prozac, Zoloft, Luvox or Desyrel, is just as effective as "Phen-fen" in generating weight loss, and the SSRI drugs do not cause PPH.
The risk or severity of hypertension can be increased when Phentermine is combined with Acetylsalicylic acid. The risk or severity of Tachycardia can be increased when Phentermine is combined with Aclidinium.
Phentermine is an indirectly acting sympathomimetic amine. It is thought to indirectly stimulate adrenoceptors, and possibly serotonin receptors, by inhibiting the reuptake or metabolism, and by enhancing the release of these monoamines (Perchenet et al., 2001).
The results from two randomized clinical trials and one 2-year extension study showed a slight increase in the average heart rate for those taking fixed-PHEN/TPM (4–6). For those taking high-dose fixed-PHEN/TPM (PHEN 15 mg/TPM 92 mg), average heart rate increased from baseline by 1.2 to 1.7 beats per minute.
Medications that have been linked to heart valve disease include:
Phentermine is used short-term to manage obesity. Phentermine is thought to work for weight loss by stimulating the release of norepinephrine in the brain, particularly in the hypothalamus. This activates the fight-or-flight response, suppressing appetite and increasing breakdown of stored fat for energy.
Cardiologists generally advise avoiding processed meats, sugary drinks and sweets, and foods high in trans fats and sodium, like most fried foods and salty snacks, because they raise bad cholesterol, blood pressure, and inflammation, significantly increasing heart disease risk. Focusing on whole foods and limiting these culprits is key for heart health.
Evidence from epidemiological studies suggest that even small improvements in the amount of daily walking is better than no walking, and greater increases confer larger cardiovascular health benefits. Patients may accrue short-terms gains such as improved fitness, body composition, blood pressure and lipid profiles.
It is now not uncommon to see patients living for more than 20 years after a heart failure diagnosis.
EVIDENCE-BASED ANSWER. In patients without cardiovascular disease, long-term use (>365 days) of phentermine does not cause significant worsening of heart rate or blood pressure. When comparing moderate and long-term use with short-term use, there is no increase in cardiovascular disease or death (SOR: B, cohort study).
Three early warning signs of heart failure include persistent fatigue/weakness, shortness of breath (especially with activity or lying down), and swelling (edema) in your legs, ankles, and feet, often accompanied by rapid weight gain from fluid buildup, all signaling your heart isn't pumping efficiently enough. Other key indicators are a chronic cough (sometimes with pink mucus) and heart palpitations.
Phentermine is one of the most prescribed weight-loss medicines. But it isn't a good choice for people with heart disease, high blood pressure, an overactive thyroid gland or glaucoma. It also isn't for people who are pregnant, may become pregnant or are breastfeeding.
You should not take phentermine if you are allergic to it, or if you have: a history of heart disease (coronary artery disease, heart rhythm problems, congestive heart failure, stroke);
Brontil is a stronger dietary medication than Phentermine. Bontril and Phendimetrazine are more likely to cause drug dependence due to it having more stimulants in their chemical makeup. Phendimetrazine should be taken for short periods of time. Phentermine can be taken for up to 3 months.
While phentermine does not directly burn fat, it can indirectly support fat loss. By reducing appetite and calorie intake, phentermine can lead to the utilization of stored fat for energy. Some evidence suggests it might modestly impact metabolic rate as well.