Phentermine 37.5 mg Dosage Information

General Educational Information

Phentermine 37.5 mg dosage should be determined by a qualified healthcare professional based on the individual patient’s circumstances. The 37.5 mg tablet is one available strength of phentermine hydrochloride, and dosing should be individualized according to the prescribing information and the patient’s response.

Official-Label Dosing Information

U.S. prescribing information states that the usual adult dosage for a 37.5 mg phentermine tablet is one tablet daily, as directed by the prescribing physician. The label also indicates that the dosage should be individualized to obtain an adequate response with the lowest effective dose.

Timing & Morning Administration

According to official labeling, the 37.5 mg tablet is generally taken before breakfast or 1–2 hours after breakfast. Taking phentermine later in the day may cause insomnia, so the timing should follow the instructions provided with the prescription.

Follow the Prescription Label

Follow your phentermine 37.5 mg instructions exactly as provided by your healthcare professional and the prescription label. Individual instructions may differ depending on the patient’s circumstances.

Don’t Change Dosage Without Medical Advice

Do not increase, decrease, split, or otherwise change your phentermine dosage without first consulting your prescriber. If the prescribed dose seems too strong or too weak, discuss it with your healthcare professional rather than adjusting it yourself.

Weight Management: Phentermine is used as a short-term adjunct to a medically supervised weight-management program for appropriately selected patients. It is not intended to replace healthy eating, physical activity, or other components of a long-term weight-management plan.

Appetite Suppressant: Phentermine is classified as a sympathomimetic amine anorectic, meaning it can act as an appetite suppressant. By helping reduce appetite, it may support reduced calorie intake when used as part of an appropriate treatment plan.

Role in Obesity Treatment: For eligible patients, phentermine may be prescribed as part of obesity treatment and weight management. Treatment decisions should be based on an individual’s overall health, BMI, weight-related risk factors, medical history, and potential risks.

Diet & Physical Activity: Phentermine is intended to be used alongside lifestyle measures, which may include:

• A calorie-controlled eating plan
• Regular physical activity
• Behavioral changes that support healthy weight management

Medication alone is not a complete weight-management strategy. A healthcare professional may recommend a broader plan based on individual needs.

Medical Supervision: Because phentermine is a prescription medication with potential side effects, contraindications, and drug interactions, its use should be supervised by a qualified healthcare professional. The prescriber can determine whether treatment is appropriate and monitor the individual’s response to the prescribed plan.

Side Effects & Safety

Phentermine can cause side effects and has important safety warnings. Because it is a prescription medication, patients should follow their prescriber’s instructions and discuss their medical history and current medications before starting treatment.

Common Phentermine Side Effects

Possible phentermine side effects may include:

• Dry mouth
• Unpleasant taste
• Constipation or diarrhea
• Headache
• Dizziness
• Restlessness or nervousness
• Insomnia
• Tremor
• Increased heart rate or palpitations
• Increased blood pressure

Side effects can vary between individuals. Contact a healthcare professional if symptoms are persistent, severe, or concerning.

Contraindications

Phentermine may not be appropriate for people with certain medical conditions. Important contraindications can include:

• History of cardiovascular disease
• Uncontrolled hypertension
• Hyperthyroidism
• Glaucoma
• Agitated states
• History of drug abuse
• Known hypersensitivity to sympathomimetic amines
• Pregnancy

Phentermine should also not be used during or within 14 days of treatment with a monoamine oxidase inhibitor (MAOI) because of the risk of a serious hypertensive reaction.

Drug Interactions

Before taking phentermine, tell your healthcare professional about all medications, supplements, and herbal products you use. Important phentermine precautions include potential interactions with:

• MAOIs
• Other weight-loss medications
• Certain medications that affect blood pressure or heart rate
• Diabetes medications, which may require treatment adjustments
• Alcohol, which may increase the risk of adverse reactions

A healthcare professional or pharmacist can review potential interactions based on your individual medication list.

Cardiovascular Warnings

Phentermine can affect the cardiovascular system and may increase heart rate, palpitations, or blood pressure. It is generally not appropriate for people with certain cardiovascular conditions.

Seek medical advice promptly if you develop concerning cardiovascular symptoms. Rare but serious conditions, including pulmonary hypertension and heart-valve problems, have been reported in connection with appetite-suppressant medications.

Misuse & Dependence

Phentermine is classified as a Schedule IV controlled substance in the United States. It has the potential for misuse and dependence and should be taken only by the person for whom it was prescribed.

• Take more than the prescribed dose
• Share the medication with another person
• Use it for purposes other than those prescribed
• Change the treatment plan without medical guidance

When to Seek Medical Attention

Seek prompt medical attention for serious or unusual symptoms, including:

• Chest pain
• New or unexplained shortness of breath
• Fainting
• Severe or persistent palpitations
• Swelling of the legs or ankles
• Signs of a severe allergic reaction

Who May Be Eligible?

Phentermine eligibility should be determined by a qualified healthcare professional. Factors such as BMI, obesity-related health conditions, medical history, current medications, and potential risks may all be considered before a phentermine prescription is issued.

BMI

For certain adults, phentermine may be considered as part of a medically supervised weight-management program. U.S. prescribing information generally describes its use for patients with an initial BMI of 30 kg/m² or higher, or 27 kg/m² or higher when certain weight-related risk factors are present.

However, meeting a particular phentermine BMI threshold does not automatically mean the medication is appropriate. A healthcare provider must assess the individual’s overall circumstances.

Obesity & Weight-Related Conditions

For individuals with a lower BMI threshold, certain weight-related conditions may be relevant to treatment decisions. These can include conditions such as:

• Controlled hypertension
• Type 2 diabetes
• Hyperlipidemia or other weight-related risk factors

The presence of a qualifying condition does not guarantee eligibility. The potential benefits and risks must be evaluated individually.

Medical History

Before prescribing phentermine, a healthcare professional should review the patient’s medical history. Certain health conditions may make phentermine inappropriate or require particular caution.

This review may include consideration of:

• Cardiovascular disease
• High blood pressure
• Hyperthyroidism
• Glaucoma
• Pregnancy or plans for pregnancy
• History of drug misuse or dependence
• Other relevant medical conditions

Current Medications

A complete review of current medications is important before starting treatment. Patients should tell their healthcare professional about:

• Prescription medications
• Over-the-counter medicines
• Vitamins and supplements
• Herbal products
• Other weight-management medications

Some medications can interact with phentermine, and certain drugs, including MAOIs, may make its use inappropriate.

Healthcare-Provider Assessment

A qualified healthcare professional should determine whether phentermine is suitable after reviewing the individual’s weight-management needs, medical history, BMI, weight-related conditions, and current medications.

If treatment is considered appropriate, phentermine is generally used as part of a broader plan that may include:

• Calorie-controlled nutrition
• Physical activity
• Behavioral or lifestyle changes
• Ongoing medical supervision

Prescription Requirement

Phentermine is a prescription medication. A valid phentermine prescription is required before it can be dispensed through an appropriately licensed pharmacy, subject to applicable laws and regulations.

K 29 Phentermine Product Specifications

Feature	Details
Product	K 29 Phentermine
Strength	37.5 mg
Imprint	K 29
Color	Blue & White
Shape	Capsule-shaped
Size	14 mm
Manufacturer	KVK Tech Inc.
Active ingredient	Phentermine
Prescription	Required