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What Are the Side Effects of Using Fentermina?

By Missy LeRoy ; Updated July 27, 2017

Fentermina, also known as Phentermine, is an appetite suppressant used to help overweight and obese individuals lose weight. When combined with proper diet and exercise, Fentermina results in quick, optimum weight loss. However, as with any drug, there are certain precautions and possible side effects to be aware of.


Fentermina stimulates neurons in the central nervous system to release high levels of neurotransmitters such as adrenaline, dopamine and epinephrine. This increases the heart rate and blood pressure which suppresses hunger and the desire to consume a lot of food.

Prescription Strengths

Fentermina is prescribed in 15mg, 30mg and 37.5mg strength tablets or capsules.

Side Effects

According to, most people have minor or no side effects. However, some of the most common side effects are a bad taste in the mouth, decreased sex drive, constipation, diarrhea, anxiety, sleeplessness, dry mouth, headache, nervousness and upset stomach.

Some of the more severe side effects include hives, breathing trouble, tightness in the chest, swelling of the face, lips, mouth or tongue, accelerated heartbeat, and, swelling of the legs and feet. If any of these side effects occur, seek immediate medical attention.

Considerations reports that the chemical makeup of Fentermina is similar to amphetamines which are frequently abused. Due to this fact, the number of refills permitted within a certain time-frame is limited.


Fentermina should not be taken for more than 12 weeks at a time. Prolonged use can cause dependency, and the body may build up tolerance for the drug thus eliminating its effectiveness.

The more Fentermina you take, the greater the risk of adverse side effects.

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