My love of diet products is bested only by my passion for reviewing them. This is why we took a close look at Phentermine ingredients, side effects, and scientific studies. We additionally examined hundreds of user comments and dieter reviews. Lastly, we compressed all of the feedback and facts we found to give you the info you need.
What is Phentermine?
To begin, Phentermine is a weight-loss medication available by prescription only. Although instructions vary, it’s usually taken once each day, before breakfast and supposedly decreases appetite. That assists by suppressing appetite.  The blister pack makes it easy to take on-the-go.
Phentermine was first available in the United States in 1959 and is currently manufactured by several companies.
Products Similar to Phentermine
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Side Effects – “Something to Consider?”
First off, we have to take potential Phentermine side effects into consideration. “Appetite suppressants can help improve long-term weight-loss,” said our Research Editor. “But, they can also lead to side effects such as restlessness, headache, dizziness, sleep problems, diarrhea, upset stomach, constipation and dry mouth.”
One customer commented, “The sleepless nights and irritability is so not worth it. You have to remember the side effects are no good.” 
When we look at the other side of things, there are some patients who did not experience Phentermine side effects.
As one put it, “I am not hungry. No headaches, no side effects.”
Another shared, “It was amazing, minimal side effects, mostly dry mouth from not drinking enough water.”
Customer Complaints in Phentermine Reviews – “Problematic?”
We found several negative issues in Phentermine 37.5 reviews. One dieter stated, “I’m always tired with no energy and really weak feeling all the time.”
Another person said, “I took 1/2 a pill and about 5 hours later I felt sweaty and felt a thud in my chest.”
We also found some support. One user said, “This is the only pill that works for me. I am very happy with my results.”
“I took phentermine before and the weight came off even though I didn’t exercise,” reported another of the Phentermine reviews we found.
The research we’ve conducted has shown if there is some particular aspect of a diet pill considered concerning, like customer complaints, the chances of long-term success are not good. So, if Phentermine isn’t received well by customers, we become skeptical about it.
The Science – “Solid?”
There are clinical studies supporting the appetite suppressing effects of Phentermine . Although there is research showing it works, the directions only state to use on a short-term basis. This may not be beneficial for those who have larger amounts of weight to lose . At DietSpotlight, we like seeing solid science backing the claims of a company. But, if the research doesn’t point toward long-term results, we often see a big red .
What Users Are Saying
“This product works as advertised. It definitely suppresses appetite. It simply works. I take 3-5 of them per day if I need to reduce caloric intake for a period of time, in order to lose weight. I have not experienced any sense of jitteriness from using the product.”
“No side effects but not noticing decrease in appetite!”
“Does not suppress appetite.”
The Bottom Line – Does Phentermine Work?
So, will you see Phentermine results? Well, we like the longevity as a product and some positive comments we saw found, but we’re concerned about it because the research shows short-term results. Also, we’re a bit hesitant due to customer complaints and mentions of negative side effects .
If you’d like to lose those extra pounds, we suggest going with a supplement with no talk of harmful side effects and clinically-tested ingredients shown to work.
Among the best products we’ve seen this year is our product called Dietspotlight Burn. The formula contains four clinically-tested ingredients. Results are often found in publications such as The American Journal of Clinical Nutrition and the journal Obesity [6, 7, 8, 9].
Also, we’re so confident that you’ll love our supplement, that we’re offering a Special Trial Offer, which is great sign.Learn More About Burn HD »