Top 9 Phentermine Side Effects (Based on Real Data)

We all fear of being hit with Phentermine side effects. It’s a normal thing. These can be serious!

The good thing is you can take some measures to avoid them. And the great news just keep coming.

Common side effects of Phentermine tend to disappear quite soon after the beginning of the course. If the online Phentermine reviews made you anxious about taking the drug, keep reading to know what to expect and what should warn you.

Learn whether Phentermine side effects dangers are a common thing or rather a rare misfortune. As a bonus, we give you the results of a poll about the most common side effects of diet pills, voted by real users. Here’s exactly what answers you will find:

  • I feel no side effects. Does Phentermine work at all?
  • Is there a way to avoid Phentermine 37.5mg side effects?
  • What are the side effects of taking Phentermine 37.5 mg?
  • Are there any Phentermine side effects to seriously worry about?
  • List of most common side effects, reported by Phentermine users.

Yes, Phentermine works almost every time starting from the first pill. Though your individual body peculiarities might extend the reaction time.

Believe it or not, your body might need some time for Phentermine to kick in (up to 10 days).

The best part is not every single user gets side effects! Yes, the drug can work at the level of your appetite suppression and add no other new sensations.


If you feel the appetite suppression, it means that the diet pills do work. Having just the good effects without adverse reactions is your luck, so enjoy your weight loss with no disadvantages!There is no single solution-that-fits-all when it comes to avoiding body reactions to any drug. You may only lower the risk of their manifestation by taking 5 simple steps*: Tell your doctor about any chronic, recurrent and current health conditions.

Provide your doctor with a list of medications and supplements that you use.

Pass all required medical checks and tests.

Follow doctor’s recommendations about your daily Phentermine dosage and dosing frequency Do not take a double dose even if you miss a pill!.

Study the leaflet of your medication and ask your doctor questions that you have.

Do not use the drug if you are contraindicated to use it.

Stop the drug and seek medical help if you have allergy manifestations after taking the pill.

*These recommendations work for avoiding extended-release Phentermine 30mg capsules and Adipex side effects, as well, since the active ingredient is the same as in Phentermine 37.5mg

If you did not study any information about the side effects of Phentermine before, read on to see what these are, and which should warn you. Besides, you can check out the list of most common side effects below, based on real users’ experience. Even if you follow the 5 steps to minimize the chances of adverse reactions, this medication still can cause multiple common side effects, even if taken correctly. Such minor complications are a normal body reaction to a new medication and its ingredients. The list of the most frequently reported common side effects to Phentermine goes as follows:

  • dry mouth,
  • headaches,
  • dizziness,
  • problems sleeping,
  • irritability,
  • anxiety,
  • upset stomach,
  • diarrhea,
  • nausea and a few other symptoms.

But don’t let the long list scare you right away. It doesn’t mean that you will get all of the mentioned symptoms at once. You can have none at all or just a couple of unpleasant reactions. The great news is that they fade away and fully disappear in a few days after the beginning of the course. Misuse and overuse of the medication can cause more serious complications, including irregular, uneven heartbeat, uncontrolled muscle movements, sudden mood changes, decrease or sudden sharp increase in sexual interest and ability. Consult your doctor immediately after you have noticed any of such abnormalities.

  • vision changes or loss,
  • racking headache,
  • seizures and convulsions,
  • slurred speech, etc.

The drug may also cause serious lung and heart issues (sometimes even fatal) if not taken right. Besides, there have been cases of allergic reactions (hives, swelling, rashes, irritations, etc.) reported. Even though Phentermine results are quite impressive, not every person is ready to deal with some troublesome side effects, like depression and mood swings, severe rash and sweating, hair loss, as well as strong unexplainable anger (known as Phentermine rage). You can have an in-depth look at the whole list of side effects. Below, you will find the results of a poll on the most frequent common side effects that people experience while using Phentermine-containing pills:

*Check out other polls, related to patients’ experience with Phentermine.

Of course, each person’s experience is different and you may have side effects that are not included in this top-10 list. Sharing your experience with other people is extremely important. Knowing that someone else felt the same way as you did and learning from his experience of dealing with one or another side effect can be crucial for his decision on further use of the drug.

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