Phentermine – Dosage and Side-Effects


Phentermine hydrochloride may have similar effects to that of amphetamines because of its classification as a central nervous system stimulant. Phentermine hydrochloride is the only drug that is prescribed by doctors as a non-addictive drug. The US Drug Enforcement Agency (DEA) has classified phentermine diet pill as a Schedule IV controlled substance. According to FckFat, it is one of the best weight loss supplements that not only controls your appetite but also promotes higher energy levels and stimulates increased metabolism for burning extra fat.


Phentermine not only helps in weight loss but also helps to build up tolerance among people who take larger than the recommended dose. Medications of phentermine develop at different rates that mainly depend on the individual case of each person. So, it is highly recommended that the prescribed dosage of phentermine should not be exceeded by the patients to increase its effect. In this case, doctors no longer prefer to continue the drug and thus, discontinue the process rather than to increase the dosage.


Tablets and capsules are the two common forms of phentermine. So, the directions of use and the dosage entirely depend on the form of this drug. Capsules are available ranging from 30 mg to 37 mg. Sustained-release and resin complex capsules are available in 15-30mg. Regular tablets are available in 37.5 mg. Tablets that dissolve on the tongue are available in the range of 37.5 mg, 30 mg, and 15 mg. This drug is prescribed for short-term use of 12 weeks in average. In order to avoid insomnia, diet pills should be taken orally as a single dose every day in the morning.


Phentermine is generally prescribed for those people who are suffering from obesity and trying to lose a large amount of weight, i.e., 100 pounds or more. While recommending this drug, the body mass index is considered by the doctor. It is also prescribed to those individuals who are overweight and have the risk of high cholesterol level, Type 2 diabetes or high blood pressure. This diet pill should be accompanied with exercise and a reduced calorie diet. Physicians closely monitor those patients who are on phentermine to observe the results.

Phentermine – Dosage and Side-Effects1

Side Effects

Nausea, insomnia, and headaches are some of the common side effects of phentermine. The cardiovascular system can also be affected by phentermine, like increased blood pressure, increased heart rate, and heart palpitations. Phentermine also affects the central nervous system in the form of reactions like hyper-stimulation. Patients who are diagnosed with hypertension or sensitive to central nervous system stimulants should follow the cautions and contraindications against usage.

Thus, always consult your physician before starting the intake of phentermine for proper guidance of dosage.