Phentermine Weight Loss Results: How Long Does it Take for Phentermine to Work to Lose Weight


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Phentermine is an FDA approved drug for weight loss, it is arguably the longest serving prescription medication available.

In order to be prescribed weight loss drugs you should have a high BMI (Body Mass Index) or one health related comorbidity (high blood pressure etc).

One of the most frequently asked questions about this weight loss medication is “how long does it take phentermine to work?“.

This article focuses on the results of Phentermine after various stages: 1 week, 2 weeks, 1 month and so on.

What is the Best Phentermine Over the Counter Brand?

#1 – PhenQ


CLICK to view PhenQ website for price and availability

PhenQ is a phentermine OTC brand and is regularly voted the top weight loss pill by satisfied customers and health experts. Its unique blend of clinically-proven ingredients activate weight loss in five ways for unparalleled results. PhenQ contains the ?-Lacys Reset for faster metabolism and fat burning. Capsimax powder also boosts thermogenesis.

PhenQ inhibits new fat production and suppresses appetite with ingredients like Chromium picolinate and nopal cactus fiber. Finally, PhenQ enhances mood to combat the stress of dieting.

With PhenQ, you gain the power of multiple weight loss products in just one pill. PhenQ has a proven track record of safety and success, with over 190,000 customers and counting. It is the only product available that combines the effects of multiple pills while still being completely natural and vegan-friendly.

PhenQ earns the accolades of highly committed weight watchers and respected physicians alike for its fast, substantial phentermine results when used as directed. For unmatched weight loss in as fast as 60 days, PhenQ’s multi-action formula cannot be beaten. Clinically tested and critically acclaimed, PhenQ is the flagship product for a slimmer, happier life.

PhenQ targets weight loss from every angle using the most advanced ingredients. With loyal fans worldwide and numerous success stories, PhenQ is the pinnacle of innovation and achievement in over-the-counter weight loss supplements. For speed, safety and satisfaction, nothing else even comes close.

#2 – Phen24

Phen 24

CLICK to view Phen24 website and view pricing and special offers

Phen24 is another OTC diet pill that combines a daytime weight loss pill with a separate nighttime formula for 24-hour weight loss support.

The day pill contains stimulants like caffeine to boost energy and metabolism. The night pill has soothing ingredients like glucomannan to curb evening cravings, plus neurotransmitters to promote sleep.

Together, the formulas target around-the-clock calorie burning, hunger control, and restorative sleep – essential factors for successful phentermine results.

Phen24 provides sustained appetite suppression, fat burning and improved sleep quality for maximum weight loss even when dieting for just part of the day.

By using separate formulas at strategic times, Phen24 helps create an optimal internal environment in the body conducive to safe and effective weight loss over time.

#3 – PhenGold


CLICK to visit PhenGold website and see price and current deals

PhenGold contains natural ingredients to boost metabolism and fat burning for fast weight loss results.

With L-Theanine for mood support, green coffee and green tea for energizing the body and activating fat metabolism, natural fat burners Cayenne Pepper, Rhodiola SP and L-Tyrosine, and appetite suppressants like L-tyrosine and conjugated linoleic acid, PhenGold provides comprehensive support to lose weight.

It stimulates the body and brain, enhances fat burning hormones and activity, reduces hunger and cravings, and blocks fat production – all while improving mood and focus.

PhenGold’s stimulant-free, all-natural formula makes it a safe and sustainable diet pill to lose weight when combined with a reduced calorie diet and exercise.

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How Long Does Take Phentermine to Work?

Below is an explanation of how long phentermine takes to work and the landmark timescales so you can chart your progress.

Example Weight Loss After 2 Weeks on Phentermine:

In the first couple weeks of taking phentermine, you may notice some initial effects. This includes a decrease in appetite and cravings, especially for sugary and high carb foods. You may feel a boost in energy and mood. However, to significantly lose weight it usually takes longer. Most people lose 2-4 pounds in the first 2 weeks.

Phentermine Weight Loss After 1 Month:

After a month on phentermine diet pills, you can expect an average weight loss of 5% of your starting body weight, which is 3-10 pounds for most people. Your body has adjusted to the medication and dosage, and lifestyle changes have become a habit. Reduced appetite and better habits help you to lose weight over this period. It is after a month that the Phentermine before and after results begin to be noticeable.

Weight Loss Results After 2 Months:

By month 2, appetite suppression is sustained and new habits are established. Weight loss of 1-2 pounds per week, or about 10-20 pounds total over 2 months is common. BMI and blood pressure may decrease. Clothes may start to feel loose and body composition is improved. Success motivates continued progress.

How Much Weight Lost After 3 Months:

At 3 months, typical weight loss on phentermine is 15-30 pounds from your starting weight. This represents a significant decrease in excess fat and your health is likely improved. However, body fat reduction may start to slow down around this period. Dosage adjustments or taking periodic breaks may be needed to avoid plateau, as directed by your doctor.

How Much Weight Can You Lose After Taking Phentermine for 6 months:

Many people lose 20-50 pounds over 6 months with phentermine, combined with lifestyle changes. This can translate to improved blood pressure and blood sugar management for some. However, phentermine normally should not be taken longer than 12 weeks on and a few weeks off due to tolerance build up.

After 6 months, weight regain may start without learned habits in place. Maintenance strategies and possibly switching to other weight loss drugs may be needed to avoid gaining weight back.

The effects of phentermine ultimately depend on your dedication to making healthy changes. Phentermine helps by curbing appetite and boosting energy, but it is not a magic pill. Developing better habits around diet, exercise, sleep, and stress management during and after discontinuing phentermine leads to successful long-term weight loss. Prescription phentermine should only be used under the supervision of a doctor.

Most people experience the effects of phentermine within 2 weeks but significant weight loss takes 2-3 months of use. About 20-30 pounds of body fat over 3-6 months is typical for successful phentermine treatment combined with lifestyle changes. However, dosage, duration of treatment, and phentermine alone are not enough.

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When is the Best Time to Take Phentermine?

The best time to take phentermine is early in the morning, 30 to 60 minutes before breakfast. Here are some reasons why people lose weight fast using this way:

Prescription weight loss drugs like Phentermine works best when taken on an empty stomach. Taking phentermine before eating breakfast allows for the most effective absorption and minimizes the risk of nausea or stomach upset as a side effect.

Phentermine acts as an appetite suppressant, so taking it before your first meal helps curb hunger throughout the day. You will feel less hungry at breakfast and beyond, making it easier to avoid overeating. It helps you to adopt healthy eating habits and reduce calorie intake.

Phentermine gives you an energy boost due to its stimulant-like effects. Taking it in the morning prevents restlessness, insomnia or other sleep disturbances that could happen if taken too late in the day.

Habit forming is important for adherence to any medication regimen. Establishing a morning routine of taking your phentermine at the same time each day will help you avoid missing doses and get the most benefit.

Daytime activities and obligations can make it easier to skip doses if taken at varying times. A consistent morning schedule helps avoid inadvertently missing your phentermine, especially on busier days. Set a daily alarm or reminder if needed.

Lifestyle interventions like diet and exercise tend to happen earlier in the day. The appetite suppression and energy lift from your morning phentermine can help motivate you to make good choices and get active, boosting your weight loss success.

However, there are some situations where taking a stimulant drug amphetamine later in the day or splitting the dose morning and midday under guidance from your doctor may be appropriate:

  • If morning side effects like nausea are a concern, taking phentermine with lunch instead or adding an afternoon dose may provide relief while your body adjusts.
  • For those who work night shifts or have unpredictable work hours, dosing needs to fit your unique schedule. Talk to your doctor about the best timing for your situation. Splitting or adjusting doses may help maximize effectiveness and minimize disruption.
  • People who struggle with nighttime eating or cravings may benefit from taking half their phentermine dose in the morning and the other half around midday. Again, only make changes to your dosage under orders from your prescribing doctor.

In summary, taking phentermine early in your day, usually 30 to 60 minutes before eating breakfast, is ideal for most people to feel full effects while avoiding unwanted side effects. However, the best timing for you will depend on your individual situation, routine, and needs. Talk to your doctor about any concerns and before making changes to when or how you take your phentermine. Establishing the right schedule and dosage is key to your success.

How Much Weight Should You Lose in a Week on Phentermine?

When using phentermine for weight loss, a reasonable amount of weight to lose in one week is 1 to 2 pounds. Losing more than 2 pounds per week on phentermine could increase the risk of side effects. It may also not be sustainable weight loss over the long run.

Some key points about weekly weight loss on phentermine:

Phentermine works by suppressing your appetite, but it does not directly cause weight loss. Losing weight depends on you creating a calorie deficit, which means burning more calories than you consume each day. Aim for a 500 to 1000 calorie deficit per day through diet and exercise to lose about 1-2 pounds in a week.

Losing weight at a rate of 1-2 pounds per week is a safe guideline for most people. Losing weight faster than this on phentermine could mean you are losing excess water or muscle instead of fat. Slower, steady excess weight reduction will be more likely to stay off long-term.

The more you have to lose, the faster initial weight loss may be. Someone with 100+ pounds to lose could drop 3-5 pounds in a week when first starting phentermine, then settle into a 1-2 pound per week loss. Be sure to stay hydrated and get enough protein/nutrients to avoid losing lean body mass.

Dosage, diet, exercise, sleep and other factors affect your weight loss. The amount of weight you lose from phentermine alone will depend on the dosage prescribed by your doctor. Combining phentermine with lifestyle changes will result in the most weight lost. Lack of sleep or high stress can slow BMI reduction.

Weigh yourself once a week at the same time for the most accurate tracking. Daily weighing may show fluctuations in water weight and be discouraging. Record your weekly weight loss to stay on track and make sure you’re losing at a safe rate.

Plateaus and slowing weight loss are normal. Weekly weight loss may not always be consistent. Your body may stall as it adjusts to phentermine or lifestyle changes. Stay patient and consistent and weight loss will continue over time. Small adjustments to your plan may help overcome plateaus.

Talk to your doctor if you have concerns about your weight loss. If you are not losing 1-2 pounds per week on average or are experiencing significant side effects, your phentermine dosage or current weight loss plan may need adjustment. Your doctor can evaluate how to maximize benefits while maintaining safety based on your unique situation.

What Should You Not Eat When Taking Phentermine?

Some foods to avoid or limit while taking phentermine include:

High sugar foods: Cookies, candy, baked goods and other sugary treats should be avoided. They provide empty calories but little nutrition. Phentermine helps curb cravings for these foods, but eating them can still slow your weight loss.

High fat foods: Full-fat dairy products, fatty meats, fried foods and fast food are high in fat and calories but not filling. They will work against your weight loss efforts. Choose low-fat or fat-free options and lean protein sources.

Junk food: Chips, pretzels, crackers and other salty junk snacks are tempting but full of empty calories. They lack nutrients but pack in calories, fat and salt. Avoid eating them altogether.

Carbohydrate-heavy meals: Large portions of pasta, rice, bread and other high-carb fare can spike blood sugar and stimulate hunger. Limit portion sizes of these foods, especially at dinner. Focus on balancing them with lean protein and healthy fat.

Caffeine and carbonation: Too much caffeine from coffee, tea and energy drinks can exacerbate side effects from phentermine like restlessness or insomnia. Limit to 1 serving per day. And avoid or limit fizzy drinks—they fill you up without providing nutrition.

Alcohol: Drinking alcohol while taking phentermine may increase the risk of adverse reactions such as dizziness or rapid heartbeat. It also negatively impacts appetite and sleep which are important for weight loss. Avoid alcohol altogether during your course of phentermine treatment.

Grapefruit juice: Grapefruit juice interacts with many medications, including phentermine. It can influence how phentermine is broken down in your body, making side effects more likely. Do not consume any grapefruit or grapefruit juice while taking phentermine.

Spicy foods: Spicy foods may irritate your stomach, especially when you first start taking phentermine. They can exacerbate side effects such as nausea or diarrhea. Avoid spicy fare until you know how you tolerate phentermine and can introduce spices gradually.

Late night eating: Eating large or high-calorie meals late at night can disrupt your sleep and stimulate appetite, working against your weight loss goals. Avoid eating 2-3 hours before bedtime. Stay hydrated at night if needed but don’t overeat.

Discuss any specific concerns about foods to avoid with your doctor based on your dosage and duration of phentermine treatment. Temporary diet changes and limitations can help you lose weight on phentermine while managing side effects and setting yourself up for long term success after stopping the medication. Making smart food choices and developing better habits will keep weight off even after ending phentermine.

Is it Better to take Phentermine on an Empty Stomach?

Is it Better to take Phentermine on an Empty Stomach? Yes, taking phentermine on an empty stomach 30-60 minutes before breakfast or 1-2 hours after breakfast is best. This maximizes absorption and effectiveness. Phentermine may cause nausea, so taking it with food could worsen side effects.

Should You Take Phentermine 37.5 mg Twice a Day?

Should You Take Phentermine 37.5 mg Twice a Day? No, you should only take phentermine once per day as directed by your doctor. Taking an extra dose could increase the risk of dangerous side effects. Only change your dosage under guidance from your doctor.

How Fast Can I Lose Weight on Phentermine?

When used alone, most people lose an average of 3-5% of their body weight over 12 weeks of phentermine treatment. However, weight loss will depend on factors like your starting weight, dosage, diet, and exercise. A reasonable amount is 1-2 pounds per week. Losing too quickly often means losing water or muscle instead of fat.

How Do I know if Phentermine is working?

reduced appetite and hunger

  • lessened cravings for food, especially sugar and carbs
  • weight loss of at least 1-2 pounds per week (from initial body weight)
  • improved energy and alertness
  • better mood and motivation for lifestyle changes
  • smaller waist/clothes size and improved body measurements

If you do not notice these effects within a few weeks of starting phentermine or your weight loss plateaus quickly, the dosage or current plan may need adjustment. Talk to your doctor about maximizing the benefits. Phentermine does not work for all individuals. Close monitoring and making diet/exercise changes are key to success.

Phentermine for Weight Loss Results FAQ

1. How long does it take for phentermine to work to lose weight?

Phentermine starts working within a few days to reduce your appetite, but significant weight loss can take at least 3-4 weeks of use. Most people lose 2-5 pounds the first month. It may take 3 months to see 15-30 pounds lost with phentermine and lifestyle changes. Results depend on factors like dosage, diet, exercise and consistency.

2. Can I expect to lose a lot of weight with phentermine?

It depends on your starting weight and how well you adhere to the recommended diet and exercise plan. Many overweight people lose 15% to over 20% of their excess weight (30-50 lbs) in 6-12 months with phentermine and lifestyle changes. However, phentermine alone does not usually lead to more than 5% weight loss over 12 weeks. Making sustainable changes is key.

3. How much weight can I lose per week on phentermine?

Most people lose 1-2 pounds per week on phentermine. Losing 2-5 pounds a week is common when first starting treatment, due to loss of water weight and glycogen stores. However, losing more than 2 pounds a week after the initial period could mean you are losing muscle rather than fat. Gradual weight loss leads to the best results long-term. Aim for cutting 500-1000 calories per day through diet and exercise for optimal and sustainable progress.

4. Can phentermine stop working for weight loss?

Yes, phentermine can become less effective for weight loss over time. Your body develops tolerance to phentermine within a few weeks of use. Maximum weight loss effects are often seen within 3-4 months. Phentermine is only approved for short-term use (3-6 weeks). Cycling on and off the medication, taking breaks, or switching to other weight loss drugs may be needed to continue progress. Lifestyle interventions will be most critical for ongoing success.

5. Will my weight loss stall or plateau on phentermine?

Plateaus or slowed weight loss are common with phentermine, especially after the first couple months of use. Reasons for weight loss plateaus include:

Loss of effectiveness: Your body has adapted to the phentermine dosage or duration of treatment. Talk to your doctor about adjusting your treatment plan.

  • Inconsistent calorie deficit: You may have stopped cutting enough calories or need to modify your diet/exercise routine. Track your calories and physical activity to identify any issues.
  • Lifestyle challenges: Factors like lack of sleep, hormonal changes or increased stress can negatively impact your weight loss. Try addressing lifestyle issues and be patient – the plateau should pass.
  • Hitting a “normal” loss: After losing the initial water/glycogen weight, 1-2 pounds per week is a typical rate. Accept this as proper progress rather than a plateau.
  • Building muscle: If you’ve started or increased exercise, you may have gained some muscle. Use body measurements and how your clothes feel in addition to the scale.

The key is making sustainable changes to overcome plateaus, with adjustments as needed to your treatment plan under guidance from your doctor. The most successful dieters persevere despite obstacles or slower periods. Stay consistent and committed for the best long-term phentermine results.

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