Home » Health & Wellness » Weight Loss 9 Dangerous Side Effects of Weight Loss Pills That Will Blow Your Mind July 29, 2025 by Pranay David Fact checked We have a team of smart fact checkers. They make sure our content is accurate. They use the best sources like medical journals and government websites. You can find their names and profiles on the articles they check. Important: This article is for informational purposes only. Please read our full disclaimer for more details. Weight loss pills or the slimming pills are short cuts to weight loss but they do not come with the required guarantee. Moreover they are mostly unsafe. It is always preferable to not take the diet pill and go for the hard way to shed your weight. Exercise regularly and go for a balanced diet. Here we will discuss the side effects of the weight loss pills that you should consider before consuming.(1) Article Contains 9 Side Effects of Weight Loss Pills Addiction Liver Damage Pulmonary Hypertension Diarrhea Increases risk of Heart Attack and Stroke Mood Swings Insomnia Constipation General Side Effects 9 Side Effects of Weight Loss Pills 1. Addiction Diet pills are known to cause extreme addiction among persons who take it frequently and are dependent on them instead of exercising and following a healthy diet. It gives a false sense of dependency that the extra pounds will vanish like magic. As a result individuals not focus on eliminating their bad habits and following a healthy routine become addicted to these pills.(2) 2. Liver Damage This is one of the major permanent damage caused by the consumption of the weight loss pills. There are various cases of severe liver damage occurring due to the consumption of weight loss pills and liver transplants were required. As it emulsifies the fat at an uncertain speed, the liver can’t cope by producing enough bile thus affecting the liver health and damaging it permanently.(3) 3. Pulmonary Hypertension This is another long term side effect that is associated with weight loss pills. These pills affect the heart in a very slow manner. It starts with increased heart rates, palpitation and anxieties. It can eventually become a severe permanent heart disease and can turn fatal.(4) 4. Diarrhea canva It is side effect you will face if you are continuously consuming weight loss pills. Some of the constituents in the pill stimulates diarrhea.(5) 5. Increases risk of Heart Attack and Stroke Consuming these weight loss pills can be extremely harmful. It has been observed that often these pills contain stimulants that cause heart attack and stroke. These stimulants are generally prescription level drugs that are banned but they easily make their way back to the market through these drugs as these dietary supplements are poorly monitored and regulated. It is thus very important to be careful of the kind of medicines that you are planning to consume.(6) 6. Mood Swings The weight loss pills have a huge psychological effect on the consumer. One tends to become emotionally dependent on the medicine. It causes a lot of mood swings in an individual. It is common for the person to think that he or she can only lose weight through the pill and continue to take that drug which harms the body and plays with the mind.(7) 7. Insomnia Going through a period of lack of sleep is not uncommon while consuming the diet pills. The pills contain stimulants that reduce a person’s desire to sleep. It also affects peaceful sleep in a person. It gives rise to sympathomimetic anemia in a person.(8) 8. Constipation Apart from causing diarrhea the constituents used in certain diet pills like ‘Diethylpropion’ tend to cause constipation in individuals. If the person is already suffering from this problem then it with aggravates this problem. It is best to consult your doctor if you are planning to take this pill and avoid the problems that come along with it.(9) 9. General Side Effects Among some individuals it is not one side effect that is noticed but multiple. It commonly happens when one is too addicted to the diet pill without realizing that it is adversely affecting their health. The weight loss pill obstructs the absorption of important nutrients that is essential for the proper functioning of the body. This leads to multiple side effects like dry mouth, headaches, urinary tract problems, hair loss, stomach pain, excessive sweating and other such symptoms. These are some of the common side effects that affect a person relying on these pills for a better figure. It adversely affects your body. It is important that you consult a doctor the moment you feel any irritation in your body. It is always preferable to exercise and have a good diet.(10) Reference Mayo Clinic – Weight loss National Library Of Medicine – Addiction potential of phentermine prescribed during long-term treatment of obesity National Library Of Medicine – Liver Injury from Herbal, Dietary, and Weight Loss Supplements National Library Of Medicine – Drug-induced pulmonary arterial hypertension: a primer for clinicians and scientists National Library Of Medicine – Cardiovascular Safety and Superiority of Anti-Obesity Medications National Library Of Medicine – Mood Disorder National Library Of Medicine – Obesity Management: Clinical Review and Update of the Pharmacologic Treatment Options National Library Of Medicine – A Lethal Case of Sphingomonas paucimobilis Bacteremia in an Immunocompromised Patient National Library Of Medicine – Weight Loss Supplements: Boon or Bane? 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