How Long Does it Take for Phentermine 37.5 To Work

How Long Does it Take for Phentermine 37.5 To Work?

Phentermine is used under different brand names for the treatment of obesity and overweightedness among individuals with additional risk factors like diabetes, heart conditions, or hypertension.

It falls under the class of medicines called sympathomimetic anorexiant stimulants. It can be used either alone or in combination with other medications and also other therapy options like physician-designed proper diet programs and appropriate trainer-based workout routines.

It is not determined if phentermine 37.5 mg is safe to use among individuals younger than sixteen years of age. It is also a federally regulated and controlled drug because it is chemically related to the medicinal agent amphetamines and amphetamines have a high tendency of dependence and addiction. Hence, phentermine is one of the carefully observed and regulated substances as well.

It is advised to observe patients for signs of dependency, abuse, and addiction. If there’s a need to discontinue the drug it should be done gradually over some time.

Abruptly discontinuing can cause the onset of unpleasant adverse withdrawal effects. The selling or giving out of the drug without a proper prescription from a qualified physician is prohibited and is considered an act of illegal drug trade.

Symptoms and Condition

Basically, phentermine is utilized for weight loss and getting rid of obesity. However, due to the depending and addicting nature of the medicine, it is not just casually prescribed in common everyday weight loss programs and treatments.

Phentermine is used for weight loss with patients who suffer from added risk factors such as diabetes, heart conditions or hypertension, etc. Because these conditions can prove to be extra hazardous and at times fatal in people who are overweight and obese. Therefore, the weight issue needs to be taken care of and treated in such people on a priority basis.

How Long Till Phentermine 37.5 mg Takes Effect

Phentermine 37.5 mg gradually starts taking effect right after it’s consumed. The effect reaches the peak level after about 4.5 hours after taking the medication.

You can likely tell it’s the peak effect time because you can feel the effect through certain sensations and conditions. These telling signs might contain a drop in appetite, hyperactivity, elevated anxiety, pains in the chest, or a feeling of euphoria.

The period of taking effect can vary depending on the varying dosages. For instance, the extended-release tablet will have a different peak effect time from the separately taken three pills before meals.

The effect taking onset and peak timing can also vary depending on the patient’s genetics, metabolism, and age. Young people are likely to absorb the drug in their system faster. Similarly, good fast metabolism aids with fast effect taking aspect too.


Phentermine has a similar sort of effect as amphetamines. Like amphetamines, phentermine also works by increasing substances like serotonin and dopamine in your system. That is why it has high tendencies of dependence leading to misuse and abuse plus an addiction to the drug.

Hence, phentermine 37.5 mg is advised to be started in lower quantity with either with half tablet or dosages divided in half like 18.75 mg twice a day. It is also why it’s deemed appropriate for short-term use only.

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