Phentermine Side Effects

Teresa Hong

Teresa Hong


Teresa Hong is a dietician who is actively engaged in food education. Develops nutritional methods available to as many people as possible. Offers specific dietary modification tools for people with endocrine disorders, food allergies, atherosclerosis, malnutrition, irritable bowel syndrome and other diseases. She will help to get rid of stress and enjoy every meal again!

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– Updated March 19, 2022

Do you want to lose weight quickly and effectively with Phentermine?  Are you concerned about the possible consequences it might have on your body? Let’s talk about the side effects of Phentermine. What can happen when taking a weight loss course, and what to do to avoid the adverse reactions?

Phentermine long-term side effects

Among the long-term adverse reactions of Phentermine there are the following:

digestive issues like nausea, vomiting, diarrhea, or constipation
dry mouth, an unpleasant lingering taste, and mucus in the throat
body rash
increased heart rate and blood pressure
decreased libido
CNS issues like hyperactivity, insomnia, irritability, and dizziness

Taking Phentermine and feeling hot is also a common side effect that passes quickly.

Since Phentermine causes the rapid release of the active substance, you need to pay attention to these symptoms and immediately report them to your doctor should they occur. Luckily, these symptoms appear in very rare cases.

Serious side effects of Phentermine may include:

pulmonary hypertension (high blood pressure in the lungs)
stenosis (poor functioning of the heart valve that can result in shortness of breath during a workout)
swelling and cramps
incoherent speech, confusion, and inability to concentrate

If you experience any of the listed side effects when taking Phentermine, inform your doctor immediately. 

If you have diabetes, consult your doctor first because you may need to reduce the dose of insulin. Do not take Phentermine if you are planning a pregnancy, are already pregnant, or are breastfeeding.

When it comes to the long-term side effects of Phentermine, prolonged use of the drug can result in physical and psychological dependence.

If you suddenly stop taking Phentermine, you may experience the following withdrawal symptoms:

excessive drowsiness
fatigue and withdrawal syndrome

Why Phentermine causes back pain

Some people may experience extremely severe side effects when taking this drug. For example, back pain can signify a possible heart attack, especially if combined with hands’ numbness. Meanwhile, pain in the lower back can indicate kidney stones.

Inform your doctor or seek medical help immediately if you have the symptoms listed above, as your health may be at serious risk.

Images of rash with Phentermine

Phentermine can cause itching or hives. An allergy to a drug occurs when a person’s immune system reacts to a normally harmless substance as harmful. The most common dermatological manifestation of a drug allergy is a rash. 

It is difficult to predict whether you’ll experience an allergic reaction to Phentermine. Still, if you already have a history of drug allergies, this increases the chances of having a Phentermine allergy. Inform your doctor about all existing allergies before having this drug prescribed to you.

Phentermine and alcohol

If you think that losing weight with Phentermine and limiting your food intake is a reason to treat yourself to a glass of wine on the weekend – you are wrong.

Doctors prescribing Phentermine to patients absolutely prohibit drinking alcohol while taking the drug to prevent physical and mental side effects.

Alcohol itself is addictive and causes some unpleasant consequences the following day. However, alcohol combined with Phentermine can increase the risk of suffering from Phentermine side effects dangers.

Alcohol relaxes the body while Phentermine stimulates it. These two completely opposite effects can lead to unpredictable reactions and consequences. 

Let’s look into this more thoroughly:

Alcohol irritates the stomach. Therefore, gastrointestinal tract side effects, like nausea and vomiting, are very common. Dry mouth, abdominal pain, and heartburn are among other common side effects.

Mixing Phentermine and alcohol can lead to serious side effects like high blood pressure, sleep issues, and arrhythmia. Even a small amount of alcohol can increase the risk of a heart attack or stroke if combined with Phentermine.

Alcohol affects the liver and slows down the fat-burning processes.

Mixing alcohol and phentermine causes addiction and, as a result – a side effect in the form of a withdrawal syndrome.

How to Avoid Phentermine Side Effects

1. Do not exceed the prescribed drug dosage under any circumstances.
2. Consistently monitor your well-being and if side effects occur, consult your doctor to reduce the dosage.
3. Do not drink alcohol and other stimulants.
4. Do not engage in excessive physical activity.
5. Balance out your meal plan.
6. Ask for support from like-minded people, as this will help you manage your psychological and emotional states.

This article uncovered the main Phentermine side effects that the drug can cause both on its own and when combined with alcohol during the treatment. Most of these side effects may disappear when your body gets used to the drug.

Besides that, your doctor can provide recommendations on preventing or minimizing some of these side effects. The important thing is to pay attention to how you feel and immediately contact your doctor if any serious symptoms occur!

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