Phentermine Risks Prevention

Phentermine Side Effects: Risks And Prevention

, reviewed by
 – Updated May 8, 2023
, reviewed by
 – Updated May 8, 2023
Table of Contents
Table of Contents

When you take any drugs, you read the leaflet, right? You will never take 5 tablets of Rizatriptan to have a better effect on migraine  because you read about the drug’s possible negative effects.

Each potent drug has its adverse reactions and contradictions. The same is with weight-loss medication. Phentermine adverse effects are written in the drug’s leaflet as well.

Although not all the users experience negative side effects of Phentermine, you’d better know the enemy by sight.

In this article, we will answer all the questions about this diet pill: Phentermine side effects, possible risks of Phentermine, and how to cope with it.

Long-term Side Effects Of Phentermine

If you are afraid of taking diet pills because of the long-term side effects of Phentermine, just take a deep breath:

  1. Not all the severe adverse effects last forever.
  2. Many people don’t experience adverse reactions for the whole treatment period. Maybe you will also be a lucky man.
  3. The same negative impact may last for one for 3 months, for another – a few days.
  4. Ask your doctor who knows your medical conditions about dealing with adverse effects.

However, if you experience severe side effects on Phentermine for a long time, contact your doctor. Maybe you need to change the dosage or stop taking weight-loss pills.

Let’s describe the most common and rare, short-term and long-term Phentermine adverse reactions.

Phentermine 30 mg side effects

Any medicine can have adverse reactions. However, for many people, Phentermine, Phentermine HCL, and Phentermine Juno Er 30mg side effects are either minor or non-existent.

These adverse reactions may include:

  • Dizziness or headache;
  • Nervous tension and agitation;
  • Diarrhea or constipation;
  • Dry mouth;
  • Sleep disorders;
  • Violation of taste perception;
  • Decreased sex drive;
  • Anxiety.

This list of possible adverse effects is not exhaustive. If you have any questions about side effects, don’t hesitate to contact your doctor.

Side effects of Phentermine 37.5 mg

Adverse reactions of Phentermine 37.5 are the same as Phentermine Hydrochloride side effects. Phentermine Hydrochloride is the hydrochloride salt form of Phentermine.

The most common side effects of Phentermine 37.5 mg are:

  • dry mouth;
  • constipation;
  • insomnia;
  • dizziness;
  • moderate pressure increase;
  • tachycardia.

All the adverse reactions of this dosage may be less than 40 mg but stronger than 15 or 30 mg.

Phentermine side effects

Phentermine 40 mg side effects

Phentermine 40 mg side effects are quite the same as other dosages. However, it’s the most potent dose of the drug, the effectiveness is higher, and the risk of adverse effects is pretty higher. But again, some people feel ok on this dosage. At the same time, other users may experience severe adverse reactions and need to decrease the dose to the lower one.

Phentermine side effects dangers

Is Phentermine bad for you? Unless you don’t experience severe side effects, there is no danger for you.
Call your doctor or seek medical help if you have any of the following signs or symptoms that may be associated with severe Phentermine side effects dangers:

  • Signs of an allergic reaction such as rash, hives, itching, red and swollen skin with blisters or peeling, possibly in combination with fever, wheezing, tightness in the chest or throat, difficulty breathing, swallowing or speaking, unusual hoarseness, swelling in the mouth, face, lips, tongue or throat;
  • Signs of high blood pressure include a severe headache, dizziness, loss of consciousness, or blurred vision;
  • Pain or pressure in the chest;
  • Movement disorders;
  • Mood changes;
  • Shiver;
  • Dyspnea;
  • Some people who take this type of drug may develop heart valve disease. Call your doctor immediately if you have dizziness, fatigue, or weakness that does not go away, tachycardia or palpitations, swelling of the arms and legs, or difficulty breathing.

Phentermine side effects in females

Phentermine side effects in females are more about hormones. The most reported side effect is menstrual cycle changes.

Menstrual irregularities are not a common side effect. The manufacturer in the leaflet does not mention it. However, some women experience some changes in their period. Among listed menstrual cycle changes are:

  • Missed periods;
  • Late or early periods;
  • PMS symptoms are worse than before;
  • Bleeding;
  • Light or heavy periods;
  • Postmenopausal issues.

It doesn’t mean you will undoubtedly have some “female” side effects. But forewarned is forearmed.

Important! Sometimes it’s not Phentermine to blame.

Some people who want to lose weight stop eating fats, thinking they are bad for their weight loss. It’s a common mistake!

Deficiency in using healthy fats leads to problems synthesising sex hormones, decreased libido, changes in the menstrual cycle, depression and irritability.

Phentermine breakthrough bleeding

Phentermine processes estrogen faster if you are on birth control. Taking Phentermine with birth control medicine may cause breakthrough bleeding. Phentermine breakthrough bleeding is a rare adverse reaction, but you’d better think twice or ask your doctor before taking these drugs together.

Phentermine Side Effects: Risks And Prevention

Phentermine side effects in males

Phentermine side effects in males (excluding the common listed adverse reactions) may include:

  • increased or decreased sex interest;
  • problems with erection.

Again, these are not the official side effects, but a few users have experienced them.

As we mentioned above, in women’s health, review your diet. Are you eating enough healthy fats? Insufficient intake of such fats directly affects potency and decreased libido.

Phentermine erectile dysfunction permanent

First of all, you need to understand why does it happen? Phentermine erectile dysfunction (permanent) may occur because of different factors:

  • stress, anxiety;
  • hormonal dysfunction (decreased levels of testosterone);
  • psychological issues.

If you experience loss of erection with your partner and in the morning as well, you’d better contact your doctor.

Phentermine and headache

Headache is a widespread side effect of Phentermine-based weight loss medications. Usually, it goes away after a few days or a week. If you experience severe headaches on Phentermine, ask your doctor for a pain relief drug.

What can I take for a headache while on Phentermine?

The most popular drug for headaches on Phentermine is Panadol or Paracetamol. There are no contradictions in taking both Phentermine and Paracetamol. It is also allowed to take pain relievers like Tylenol, Aleve or Ibuprofen.

How to get rid of a Phentermine headache?

First and foremost, try to relax, drink plenty of water and take a deep breath. Make sure that your body is hydrated. If you still experience headaches, take a pain reliever.

Will Phentermine headaches go away?

Usually, mild headaches disappear when your body gets used to Phentermine.

How long do Phentermine headaches last? Some people need a few days, others 1-3 weeks.

Will Phentermine headaches go away? If you don’t have other medical conditions, the answer is yes. Just give your body a little time or take a pain reliever.

Call your doctor immediately if you have high blood pressure signs or experience severe migraines.

Phentermine migraine prevention

It may be surprising, but some doctors prescribe Phentermine for migraine prevention. It’s not pure Phentermine; it’s a combination of components.

Phentermine blood pressure

Phentermine blood pressure

Phentermine belongs to the class of stimulants: when used alone, it can increase blood pressure and heart rate.

  • If you have ever had signs of high blood pressure, tell your doctor before starting treatment;
  • If you have taken medications for depression or Parkinson’s disease in the past 14 days, an episode of very high blood pressure may occur. These include isocarboxazid, phenelzine, tranylcypromine, selegiline, or rasagiline.

Can you take Phentermine with high blood pressure?

High blood pressure is often a direct consequence of being overweight. So, to lower blood pressure, you need to lose weight.

Can you take Phentermine with high blood pressure? You should ask your doctor before starting your Phentermine weight loss journey. He knows better your medical conditions.

How to lower blood pressure while on Phentermine?

How to lower blood pressure while on Phentermine depends on two factors:

  1. You have high blood pressure after taking Phentermine.
  2. You always have high blood pressure.

If Phentermine is to blame, do not self-medicate! All you can do:

  • Take a deep breath;
  • Drink plenty of water;
  • Relax;
  • Call you doctor.

If your blood pressure is consistently high:

  • Increase your physical activity ( walk more);
  • Sleep better;
  • Take your time to relax, practice yoga;
  • Avoid alcohol and caffeine;
  • Ask your doctor for additional medication.

Phentermine and heart issues

You may need to have a heart test before you start taking Phentermine. Also, tell your doctor if you have ever had any heart problems or heart disease (such as heart failure or abnormal heart rhythms).

Does Phentermine cause heart problems?

In some cases, Phentermine can cause heart problems. But such cases rarely happen. The risk is minimal if you have not had severe heart problems in the past. That is why it is better to consult a doctor in advance and do the necessary examinations if you are in doubt.

However, a high heart rate often happens on Phentermine.

How to lower heart rate while on Phentermine?

Phentermine and high heart rate are almost synonyms. It is a pervasive side effect. The amount of your heart rate also depends on the dosage and age.

What your maximum heart rate is? Use this formula to know: 220 minus your age. For example, you are 40 years old: 220-40=180. Thus, everything more than 180 is a high heart rate for you.

What about Phentermine and exercise heart rate? Of course, your heart rate rises when your physical activity is high. Use the formula above and try not to exceed the received values.

If you ever experience a high heart rate, try to relax and drink water. If you also feel pain or pressure in the chest using Phentermine, heart palpitations or increased blood pressure, don’t wait until it goes away and seek medical help.

Can Phentermine cause a heart attack?

A heart attack has been rarely reported in Phentermine users. If you have not had heart problems before and take treatment for no longer than the period prescribed by the doctor, this risk is almost zero. Please don’t neglect your health and don’t hide this information from your doctor.

shortness of breath

Why does Phentermine cause shortness of breath?

Shortness of breath may be due to heart or blood pressure problems. If shortness of breath is mild and there are no accompanying signs and pains, an allergic reaction or a psychological cause are also possible.

It doesn’t matter, why does Phentermine cause shortness of breath? In any case, you’d better contact your doctor.

Phentermine pulmonary hypertension

People taking this weight loss drug may have a higher risk of increased Phentermine pulmonary hypertension. It rarely happens; however, as a rule, this phenomenon is fatal.

According to the statistics, the risk is one per million.

Phentermine nausea

The most common side effect of the drug is Phentermine nausea or vomiting. Usually, nausea is moderate and goes away after the first week or a few weeks. So, you don’t need to take any remedies.

Phentermine nausea relief

However, if nausea makes you uncomfortable, you can use Phentermine nausea relief:

  • Stay hydrated, drink 2-3 litres of water a day
  • Avoid fried, high-fat food and carbonated drinks
  • Avoid spices
  • Consume ginger and lemon when you feel nauseous
    In other cases, contact your doctor. Maybe you must rethink your Phentermine dosage or use some medicine for nausea.

Phentermine acid reflux

Heartburn is also on the list of common mild adverse reactions. According to TGA data, Phentermine acid reflux is mainly reported by women 40-49 years old taking Phentermine for more than five years.

Don’t take drugs on your own to neutralise the acid in your stomach; ask your doctor to prescribe them.

However, you can follow some healthy rules:

  • Change your diet: avoid high-fat food, spices, chocolate, and caffeine, and eat more fruits and vegetables (except oranges, lemons, pineapple, grapefruit, and tomatoes);
  • Eat small portions;
  • Use chewing gum;
  • Drink water, camomile tea or lemon water;
  • Give up smoking.

Can Phentermine cause stomach ulcers?

People with stomach ulcers should take this drug with caution.

Can Phentermine cause stomach ulcers? It rarely happens. However, it may become a problem with uncontrolled drug administration.

Can you take Phentermine on an empty stomach?

Yes, you can. Usually, people take it first thing in the morning to avoid such adverse reactions as insomnia. So, you can take it 1-2 hours before your breakfast or 2 hours after your meal.

Phentermine side effects bloating

Can Phentermine cause gas and bloating? Yes, it can. Among Phentermine side effects, bloating is the most common one. Try to avoid high-fat foods to cope with bloating.

Sometimes bloating comes together with diarrhea or constipation.

Phentermine diarrhea

Diarrhea is a less reported adverse effect than bloating. If it goes away in a few days, that’s ok.

Call your doctor if you experience Phentermine diarrhea after eating for a long time. Do not take Phentermine if you are on antidepressants and have diarrhea.

Phentermine constipation

Constipation often happens on Phentermine. Don’t forget that you have changed your eating habits. It also leads to gastrointestinal tract issues. Some people even notice Phentermine constipation weight gain.

How to cope with constipation:

  • Stay hydrated, drink water;
  • Consume fibre-rich food;
  • Eat prunes;
  • Stay physically active;
  • Ask your doctor for a laxatives.

Talk to your doctor or seek medical help if this side effect bothers you or doesn’t go away.

Phentermine poops

It is pretty normal to have Phentermine poops once in 2-3 days. It’s not all about the drug: you eat less – you spend your time in the bathroom less.

Does Phentermine cause liver damage?

There is no particular answer to the question, “Does Phentermine cause liver damage?”. It wasn’t reported as Phentermine’s common adverse effect. Phentermine is prescribed for short-term treatment. If you follow the instruction, you shouldn’t have any severe liver problems.

Effects of Phentermine on the brain

The brain is full of nerves and neurotransmitters. The levels of these transmitters and the availability of nerves are related to things like mood and appetite. Doctors believe that Phentermine affects the nerves that control appetite. Loss of appetite is caused by nervous system excitation. These are the long-term effects of Phentermine on the brain.

There may be some short-term effects of Phentermine brain fog, dizziness, or on the contrary, good concentration and activity.

There are no specific reports of Phentermine brain damage. However, you’d better call your doctor immediately if you experience adverse reactions mentioned for a long time or have severe headaches.

Phentermine makes me feel weird

Often people notice changes in behaviour and sensations. And they think it’s a side effect on the brain, saying, “Phentermine makes me feel weird”. It happens sometimes, but not exactly.

In fact, such changes occur since phentermine increases the heart rate and quickens breathing. Accordingly, more blood enters the brain. All this provokes brain weirdness.

Can Phentermine make you tired?

Many users experience euphoria and a boost of energy on Phentermine. But can Phentermine Make You Tired? Yes, it can.

The common adverse reaction is sleeplessness. Having inadequate sleep at night, you may feel tired the whole day. The other fact may include your increased physical activity.

Generally, the swings in mood are often reported by Phentermine users.

Can Phentermine cause anxiety?

There must be cause for anxiety; typically, it lasts for a limited time. Сan Phentermine cause anxiety? Yes, some users reported this adverse effect. If you also experience suicidal thoughts, it’s not normal! If anxiety lasts for more than one-two weeks, it’s not normal.

You may find some sources where it is recommended to take Phentermine for anxiety. We shouldn’t advise it as it might work the other way around. Please ask your doctor.

Phentermine trigger bipolar

There are no specific reports that Phentermine trigger bipolar. But if you have any mental disorders, we wouldn’t recommend you take this drug. As we have already mentioned, Phentermine works in your brain and Central Nervous System. You will never know how your CNS reacts to the medicine if you have some disorders.

Phentermine and hormone imbalance

Phentermine increases the levels of adrenaline, epinephrine, serotonin and norepinephrine. These hormones make your body burn fat. It also increases the levers of leptin – a hormone of satiety. Thus, your hormonal system changes a little. Does Phentermine mess with your hormones? Not at all.

What about Phentermine and hormone imbalance? We suggest you contact your doctor if you have a hormone imbalance before starting your treatment.

HCG and Phentermine

An interaction between HCG and Phentermine has not been established. Consult your doctor if you have any worries.

Phentermine side effects hair loss

Generally, hair loss is not among the side effects of the drug, but some patients report it when taking Phentermine.

What often happens: a person wants to lose weight and begins to limit himself in food. Thus, sufficient vitamins do not enter the body. Therefore, the problem is not in Phentermine.

The main rule for losing weight is a healthy balanced diet that includes all the nutrients for health!

At the same time, the lack of official recognition of a link between Phentermine and hair loss does not mean that it does not exist but indicates that it is not a likely occurrence.

Phentermine rash on face

Phentermine skin side effects like rash on the face are rarely reported. Usually, they disappear in a week.

First and foremost, if you have Phentermine acne or Phentermine rash on your face, contact your doctor. Let him know if you have ever had an allergy. Maybe you have an allergy to one of the components of this weight loss medicine.

There are three options to deal with these adverse effects:

  • contact your doctor;
  • use a topical cream;
  • decrease the dosage.

Long-term effects of Phentermine on metabolism

Again, there are no certain studies about the long-term effects of Phentermine on metabolism. This drug works mainly in your brain, and only then does your body get involved.

Most effects on your metabolism happen because of diet and physical activity.

Phentermine body odor

There is no scientific evidence of Phentermine body odor. It may be caused by increased physical activity. But it’s not a common adverse effect of this drug.

Phentermine users sweat

Does Phentermine make you sweat more?

Some Phentermine users sweat less because of the drug. But does Phentermine make you sweat more? Yes, this can also happen.

  1. The reason may be an allergic reaction.
  2. It may be a normal body reaction because of increased heart rate and energy levels.

Does Phentermine make you feel hot?

It’s a rare adverse reaction. Does Phentermine make you feel hot? Try to cool your body, especially when exercising. Don’t forget to drink water.

Phentermine dental problems

Does Phentermine make your teeth hurt? It’s not a common adverse effect. Dental problems can occur indirectly.

The reason for Phentermine dental problems may be:

  • dry mouth;
  • nutrient deficiency;
  • grinding of teeth.

But if you decide to go to the dentist, be sure to let him know that you are taking Phentermine.

Does Phentermine cause oral thrush?

It’s not such a common adverse reaction. Ask your doctor for medication if you can’t get rid of oral thrush in a few days.

And sometimes, the problem is not in Phentermine. This drug is not an antibiotic or corticosteroid which can cause oral thrush.

Phentermine dry mouth

Phentermine dry mouth is the most common adverse reaction. It happens because of decreasing saliva production. Thus, Phentermine works. Usually, this effect disappears in a week.

Phentermine dry mouth treatment

You don’t need to wait until this adverse effect goes away. You can cope with it using Phentermine dry mouth remedies.

Phentermine dry mouth treatment includes:

  • Drinking water;
  • Chewing a sugar-free gum;
  • Lollypops and sugar-free candies;
  • Eating fruits and vegetables.

Phentermine tongue effects

Phentermine tongue effects are not listed among the standard. First and foremost, you must exclude the allergic reaction to Phentermine or one of the components.

Some users reported Phentermine tongue sores. It also may be caused by some other adverse reactions like dry mouth, for example. Your first step is to stay hydrated. If nothing happens, visit your doctor.

Phentermine Bad Breath

Phentermine Bad Breath is caused mainly by bacteria in your mouth. Usually, it comes together with a dry mouth. So, please, drink plenty of water to avoid these adverse effects. Find above how to cope with Phentermine dry mouth.

Phentermine throat issues

These adverse reactions may include a Phentermine lump in the throat or Phentermine and mucus in the throat. These are not common side effects and may even have psychological reasons. It may also be caused by:

  • Dry mouth effect;
  • Infection;
  • Bronchitis.

Anyway, you must undoubtedly contact your doctor to find the reason.

Phentermine dry mouth

Phentermine achy legs

If you experience Phentermine achy legs and the pain doesn’t go away in a few days, you’d better visit your doctor immediately. It’s a rare reported adverse reaction, but it requires medical intervention.

Your doctor will decide whether you need:

  • Stop taking Phentermine;
  • Reduce the dosage;
  • Take painkillers;
  • Examine your health.

Phentermine neck and shoulder pain

Phentermine neck and shoulder pain is a rare side effect. It would be best if you don’t tolerate it. Call your doctor and ask for painkillers.

Why does Phentermine cause back pain?

There is no individual answer to the question of why does Phentermine cause back pain? Some users have experienced back pain, but it’s also a rare adverse effect.

If you experience sudden back pain, call your doctor right away. Despite the severe adverse reaction, you’d better exclude the kidney stone.

Does Phentermine help with joint pain?

As a rule, joint pain must disappear when you lose weight. Less weight – less pain. Some users taking Phentermine in combination with other medications report improvement. Thus, if you want to take Phentermine for joint pain, ask your doctor.

Phentermine numbness, tingling

Phentermine numbness or tingling rarely happens. If these adverse effects don’t disappear in a few days and you feel uncomfortable, please get in touch with your doctor to stay safe.

Phentermine urinary retention

Phentermine urinary retention is an infrequent adverse reaction. If you experience urinary retention, don’t drink more water to go to pee. It can lead to more severe consequences. Call your doctor or go to emergency.

Does Phentermine dilate pupils?

Yes, sometimes Phentermine dilates your pupils; that’s why it’s not recommended for those with glaucoma. However, it’s not such a common adverse effect of this drug.

Phentermine and insulin resistance

If you have any special medical conditions, you’d better consult your doctor before taking weight loss drugs. Phentermine and insulin resistance is no exception. Phentermine may change your blood sugar levels. Some people even use it to lose weight and control blood sugar levels. But again, only your doctor knows your situation and health conditions.

How long do Phentermine withdrawal symptoms last?

According to statistics, all the adverse reactions disappear in a few days after stopping the treatment. So, how long do Phentermine withdrawal symptoms last? Nobody knows what time your body needs.

On the other hand, you may also feel psychological dependence. You may still experience fatigue, insomnia, bad mood. Just adhere to your doctor’s recommendations to get rid of these symptoms.


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