Phentermine
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Drug Status
Government Approvals
US(FDA), UK(BNF)
WHO Essential Medicine
NO
Known Teratogen
No
Pharmaceutical Class
Sympathomimetic Amine Anorectic
Controlled Drug Substance
No
phentermine
Summary
Phentermine is used to treat obesity, which is a condition characterized by excessive body weight. It's prescribed for individuals who need to lose weight and have not been successful with diet and exercise alone. Phentermine helps by suppressing appetite, making it easier to reduce calorie intake.
Phentermine works by stimulating the central nervous system, which includes the brain and nerves, to suppress appetite. It increases the release of certain chemicals in the brain that help reduce hunger, making you feel less hungry and more satisfied with smaller meals.
The usual starting dose of Phentermine for adults is 15 to 37.5 mg once daily, taken in the morning. It's best taken before breakfast or 1 to 2 hours after breakfast. Swallow the tablet whole; do not crush or chew it.
Common side effects of Phentermine include dry mouth, insomnia, which is difficulty sleeping, increased heart rate, and nervousness. These side effects are usually mild and may decrease as your body adjusts to the medication.
Phentermine can increase blood pressure and heart rate, so it's not recommended for people with heart disease or uncontrolled high blood pressure. It's also contraindicated in those with a history of drug abuse or who are pregnant or breastfeeding.
Indications and Purpose
How does Phentermine work?
Phentermine works by stimulating the central nervous system, which includes the brain and nerves, to suppress appetite. It increases the release of certain chemicals in the brain that help reduce hunger. Think of it like turning down the volume on your hunger signals, making you feel less hungry and more satisfied with smaller meals. This helps people eat less and lose weight. Phentermine is most effective when used with a reduced-calorie diet and exercise plan.
Is Phentermine effective?
Yes, Phentermine is effective for short-term weight loss in conjunction with a reduced-calorie diet and exercise. It works by suppressing appetite, helping people eat less and lose weight. Clinical studies show that Phentermine can lead to significant weight loss over a few weeks. However, its effectiveness can vary among individuals. It's important to use Phentermine as part of a comprehensive weight loss plan under a doctor's supervision to achieve the best results.
What is Phentermine?
Phentermine is a medication used for weight loss. It belongs to a class of drugs called anorectics, which suppress appetite. Phentermine works by affecting the central nervous system to reduce hunger, helping people eat less and lose weight. It's typically prescribed for short-term use in combination with a reduced-calorie diet and exercise. Phentermine is used to treat obesity in individuals who have not been able to lose weight with diet and exercise alone. It's important to use Phentermine under a doctor's supervision.
Directions for Use
For how long do I take Phentermine?
Phentermine is typically prescribed for short-term use, usually a few weeks, as part of a weight loss plan. It's not intended for long-term use due to potential side effects and the risk of dependence. Your doctor will determine the appropriate duration based on your health needs and response to the medication. Always follow your doctor's instructions and do not take Phentermine longer than prescribed. Discuss any concerns about the duration of use with your healthcare provider.
How do I dispose of Phentermine?
To dispose of Phentermine, take it to a drug take-back program or collection site at a pharmacy or hospital. If these options aren't available, you can dispose of it at home. Remove the medication from its original container, mix it with an undesirable substance like used coffee grounds, seal it in a plastic bag, and throw it away. This method helps prevent accidental ingestion and protects the environment. Always keep medications out of reach of children and pets.
How do I take Phentermine?
Take Phentermine as directed by your doctor, usually once daily in the morning. It's best taken before breakfast or 1 to 2 hours after breakfast. Swallow the tablet whole; do not crush or chew it. Taking it late in the day can cause trouble sleeping. If you miss a dose, take it as soon as you remember, but skip it if it's near the next dose. Do not double up doses. Avoid alcohol and follow any dietary advice from your doctor to ensure the medication works effectively.
How long does it take for Phentermine to start working?
Phentermine starts working within a few hours of taking it, as it quickly suppresses appetite. Most people notice a decrease in hunger and an increase in energy shortly after starting the medication. The full effects on weight loss may take a few weeks to become apparent. Individual factors like diet, exercise, and metabolism can affect how quickly you see results. It's important to follow your doctor's instructions and maintain a healthy lifestyle for the best outcomes.
How should I store Phentermine?
Store Phentermine at room temperature, away from moisture and light. Keep it in a tightly closed container to protect it from damage. Avoid storing it in humid places like bathrooms, as moisture can affect its effectiveness. Always keep Phentermine out of reach of children and pets to prevent accidental ingestion. Check the expiration date regularly and dispose of any unused or expired medication properly. Follow your pharmacist's instructions for safe storage.
What is the usual dose of Phentermine?
The usual starting dose of Phentermine for adults is 15 to 37.5 mg once daily, taken in the morning. The dose may be adjusted based on individual response and tolerance. The maximum recommended dose is 37.5 mg per day. Phentermine is not typically recommended for children or the elderly due to potential side effects. Always follow your doctor's specific dosing instructions and do not exceed the prescribed dose to avoid adverse effects.
Warnings and Precautions
Can I take Phentermine with other prescription drugs?
Phentermine can interact with other medications, increasing the risk of side effects. Avoid using it with other stimulants or weight loss drugs, as this can lead to serious heart problems. Phentermine can also interact with MAO inhibitors, which are a type of antidepressant, leading to dangerous increases in blood pressure. Always inform your doctor of all medications you're taking to avoid harmful interactions. They can help ensure your treatment is safe and effective.
Can Phentermine be taken safely while breastfeeding?
Phentermine is not recommended while breastfeeding. There is limited information on whether it passes into breast milk, but it may pose risks to the nursing infant. It's important to discuss with your doctor if you are breastfeeding and considering Phentermine. They can provide advice on safer alternatives for weight management that won't affect your milk supply or your baby's health. Always prioritize the safety of your child when considering medication use during breastfeeding.
Can Phentermine be taken safely while pregnant?
Phentermine is not recommended during pregnancy. There is limited evidence on its safety, and it may pose risks to the developing baby. Weight loss is not advised during pregnancy, as it can harm both the mother and the baby. If you are pregnant or planning to become pregnant, talk with your doctor about safe ways to manage your weight and health. Your doctor can provide guidance and create a plan that ensures the well-being of both you and your baby.
Does Phentermine have adverse effects?
Yes, Phentermine can cause adverse effects, which are unwanted reactions to a medication. Common adverse effects include increased heart rate, dry mouth, insomnia, and nervousness. Serious side effects, though rare, include chest pain, shortness of breath, and severe headache. If you experience any severe or concerning symptoms, seek medical attention immediately. Always inform your doctor about any new or worsening symptoms while taking Phentermine to ensure your treatment is safe and effective.
Does Phentermine have any safety warnings?
Yes, Phentermine has important safety warnings. It can increase blood pressure and heart rate, so it's not recommended for people with heart disease or uncontrolled high blood pressure. Phentermine can also cause insomnia, which is difficulty sleeping, and should be taken in the morning to avoid this. Misuse or abuse of Phentermine can lead to serious health issues, including addiction. Always follow your doctor's instructions and report any unusual symptoms immediately.
Is it safe to drink alcohol while taking Phentermine?
It's best to avoid alcohol while taking Phentermine. Alcohol can increase the risk of side effects like dizziness and can interfere with the medication's effectiveness. Drinking alcohol may also counteract weight loss efforts by adding extra calories. If you choose to drink, do so in moderation and be aware of how your body reacts. Always discuss alcohol use with your doctor while on Phentermine to ensure your treatment remains safe and effective.
Is it safe to exercise while taking Phentermine?
Yes, it's safe to exercise while taking Phentermine, but listen to your body. Phentermine can increase heart rate and blood pressure, so start with moderate activities and gradually increase intensity. Stay hydrated and watch for signs of dizziness or fatigue. If you experience any unusual symptoms during exercise, stop and rest. Always consult your doctor before starting a new exercise routine while on Phentermine to ensure it's appropriate for your health condition.
Is it safe to stop Phentermine?
It's important to consult your doctor before stopping Phentermine. Stopping suddenly can lead to withdrawal symptoms like fatigue and depression. Phentermine is usually prescribed for short-term use, and your doctor will guide you on how to stop safely. They may suggest gradually reducing the dose to minimize withdrawal effects. Always follow your doctor's instructions to ensure a safe discontinuation of the medication and to avoid any potential health risks.
Is Phentermine addictive?
Yes, Phentermine can be addictive. It is a stimulant similar to an amphetamine and can lead to physical or psychological dependence. Signs of dependence include cravings, taking more than prescribed, or using it for non-medical reasons. To prevent addiction, use Phentermine exactly as prescribed by your doctor. If you have concerns about dependence, discuss them with your healthcare provider. They can provide guidance and support to ensure safe use of the medication.
Is Phentermine safe for the elderly?
Older adults should use Phentermine with caution, as it may not be as safe as other medications for weight loss. Discuss the risks and benefits with your doctor before starting treatment.
What are the most common side effects of Phentermine?
Common side effects of Phentermine include dry mouth, insomnia, increased heart rate, and nervousness. These side effects are usually mild and may decrease as your body adjusts to the medication. If you experience any new or worsening symptoms, talk with your doctor. They can help determine if the symptoms are related to Phentermine or if there might be another cause. It's important to follow your doctor's instructions and report any side effects to ensure safe use of the medication.
Who should avoid taking Phentermine?
Phentermine should not be used by individuals with a history of heart disease, uncontrolled high blood pressure, or hyperthyroidism, which is an overactive thyroid. It's also contraindicated in those with a history of drug abuse or who are pregnant or breastfeeding. These conditions pose severe risks when combined with Phentermine. Always inform your doctor of your medical history before starting Phentermine to ensure it's safe for you. Your doctor can help determine if the benefits outweigh the risks.
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