Phentermine for weight loss

Phentermine is used with a calorie-reduced diet, exercise and a change in routine that is approved by your doctor to help you lose weight. Phentermine is used in overweight and obese people by diet and exercise. Weight loss can limit the many health risks associated with obesity, including heart disease, diabetes, high blood pressure, or shortening of life.

The mechanism of action to help lose weight of phentermine has not been determined. Phentermine can work by reducing your appetite, increasing the amount of energy your body uses, or by affecting a part of your brain. This drug helps to control appetite and belongs to the sympathetic nervous stimulant.

How should you use phentermine?

You take this drug as directed by your doctor, usually once a day, 1 hour before breakfast or 1-2 hours after breakfast. If needed, your doctor may adjust your dose to small doses three times a day. Carefully follow your doctor’s instructions. Taking this drug at the end of the day can cause sleep disturbance (insomnia).

If you are using slow release capsules, dosage is usually taken once a day before breakfast or at least 10-14 hours before bedtime. Swallow whole pills. Do not crush or chew the pill as this can release all active ingredients at the same time, increasing the risk of adverse effects.

If you are using oral dissolving pills, the usual dose is once a day in the morning, with or without food. First, dry your hands before using the medicine. Place the medication on the tip of the tongue until the drug is dissolved, then swallow it with or without water.

The dosage is based on your health condition and response to treatment. Your doctor will adjust the dose to find the best dose for you. Use this drug regularly to get the best benefits. To help you remember, use the drug at the same time each day.

This drug is usually taken for several weeks for one treatment. This drug should not be used with other anorexically active drugs. The possibility of serious side effects can occur when the time you use the drug is longer than indicated or when combined with other weight-loss drugs.

This drug can cause withdrawal syndrome, especially when used frequently for a long time or in high doses. In such cases, withdrawal symptoms (such as depression, severe fatigue) can occur if you suddenly stop taking this medication. To prevent this problem, your doctor can gradually reduce the dose. Consult your doctor or pharmacist for more information and report withdrawal reactions immediately.

In rare and unusual cases, the drug can be addictive. Do not increase the dose, take the drug more often, or use it for longer than indicated. Just stop medication when directed.

This drug can reduce the effect when you take it in a few weeks. Tell your doctor if this drug is not effective. Do not increase the dose unless directed by your doctor. Your doctor may advise you to stop taking this medication.

How should you preserve phentermine?

Store at room temperature, avoid moisture, protect from light. Do not store in the bathroom. Do not store in the freezer. Each drug may have different preservation methods. Read the packaging instructions carefully, or ask your pharmacist. Keep medicines out of the reach of children and pets.

Do not throw it in the toilet or plumbing unless required. Dispose properly when the drug is overdue or unusable. Consult your local pharmacist or local waste disposal company for safe disposal.


The information provided can not substitute for the advice of the medical professional. Always consult your doctor or pharmacist before making a decision.

What is the dose of phentermine for adults?

Normal dosage for adults to lose weight: 15 to 37.5 mg once a day before breakfast or 1-2 hours after breakfast.

What is the dose of phentermine for children?

Normal dosage for children to lose weight

17 years or older: 15 to 37.5 mg once a day before breakfast or 1-2 hours after breakfast.

What are the forms of Phentermine?

Phentermine has the following forms and levels:Compression and capsule forms, pill: 37.5 mg; 15 mg; 30 mg.

Unintended effect of Phentermine

What unintended effects do you experience when using phentermine?

Get emergency medical help if you have any of the following signs of an allergic reaction: rash; shortness of breath; swollen face, lips, tongue, or throat.

Call your doctor right away if you have a serious unintended effect such as:

  • Feeling short of breath;
  • Chest pain, feeling like you may faint;
  • Swelling in the ankles or feet;
  • Heart attack;
  • Confused or uncomfortable, having unusual thoughts or behavior;
  • Feelings of extreme excitement or sadness;
  • High blood pressure (headache, blurred vision, tinnitus, anxiety, chest pain, dyspnea, irregular heartbeat, convulsions).

Less serious unintended effects may include:

  • Feeling restless or hyperactive;
  • Headache, dizziness, tremor;
  • Sleep problem (insomnia);
  • Dry mouth or an unpleasant taste in the mouth;
  • Diarrhea or constipation, stomach upset;
  • Increase or decrease sexual desire, impotence.

Not everyone has the unintended effects listed above. There may be other unintended effects not mentioned. If you have any questions about unintended effects, consult your doctor or pharmacist.


Before using phentermine you need to know what?

Before deciding to use a drug, the benefits and risks of the drug must be weighed. This is your decision with the doctor. For this drug, the following should be considered:


Let your doctor know if you’ve ever had any unusual reactions or allergies to this drug or any other medication. Talk to your health care provider if you have any other allergies, such as food allergies, dyes, preservatives, or animals. For over-the-counter medicines, read the labels or ingredients carefully.


Phentermine use is not recommended for children 16 years and under 16 years of age. Safety and effectiveness have not been determined.


The study done so far has not proven that age problems can confound the effects of drugs in older patients. However, elderly patients are more likely to have liver, kidney, or heart disease, which requires careful use and appropriate dosage adjustment for elderly patients taking phentermine.

Things to keep in mind if you are pregnant or breastfeeding

There are no adequate studies to determine the risk of this drug during pregnancy or lactation. Before taking medicine, always consult your doctor to weigh the benefits and risks. This drug belongs to the group X for pregnancy, according to the US Food and Drug Administration (FDA).

Note: Classification of drugs for use in pregnancy:

  • A = no risk;
  • B = No risk in some studies;
  • C = risky;
  • D = evidence of risk;
  • X = Contraindications;
  • N = Still do not know;

Drug interactions

What drug can Phentermine interact with?

Drug interactions can alter a person’s ability to function or increase the effect of side effects. This document does not cover the full range of drug interactions that may occur. Write a list of the medications you are taking (including over-the-counter, prescription and functional foods) and your doctor or pharmacist. Do not use drugs, discontinue or change dosage without permission from your doctor.

Taking this medicine along with any of the medicines below is not recommended. Your doctor may choose other medicines to treat you:

  • Brofaromine;
  • Clorgyline;
  • Furazolidone;
  • Iproniazid;
  • Isocarboxazid;
  • Lazabemide;
  • Linezolid;
  • Moclobemide;
  • Nialamide;
  • Pargyline;
  • Phenelzine;
  • Procarbazine;
  • Rasagiline;
  • Selegiline;
  • Sibutramine;
  • Toloxatone;
  • Tranylcypromine.

Food and alcohol, beer interactions with phentermine?

Certain drugs should not be taken at meals or at the same time with certain foods because of possible interactions. Alcohol and cigarettes can also interact with certain drugs. Please consult your health professional about taking medication along with food, alcohol and cigarettes.

What health conditions affect phentermine?

Your health condition may affect the use of this medication. Tell your doctor if you have any health problems, especially:

  • An excited state (anxiety);
  • Has a history of arrhythmias (abnormal heart rhythms);
  • Arteriosclerosis, Severity;
  • Has a history of congestive heart failure;
  • Has a history of abuse or drug dependence;
  • Glaucoma;
  • Heart or blood vessel disease (for example, coronary artery disease);
  • Has a history of hypertension that is not controlled;
  • Hyperthyroidism (overactive thyroid gland);
  • Have a history of stroke – should not be used in patients with this condition.
  • Allergy to tartrazine – Suprenza ™ (containing tartrazine) – Patients with this condition may have an allergic reaction;
  • Heart valve disease;
  • Hypertension;
  • Hypertensive pulmonary artery (high pressure in the lungs) – Use with caution. Can make the situation worse;
  • Kidney disease – Use with caution. The reactions may be increased by slowly release of the drug by the body.


What should you do in an emergency or overdose?

In an emergency or overdose, call the emergency center immediately or go to the nearest local health unit.

What should you do if you forget a dose?

If you forget to take a dose, use as soon as possible. However, if it is close to the next dose, skip the missed dose and take the next dose at the scheduled time. Do not double the prescribed dose.

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