Examples of drugs that can cause interactions with phentermine are listed below. You shouldn't take phentermine if you're agitated. It hasn't been confirmed that this drug is safe and effective for use in children younger than 16 years. In general, ethanol ingestion may aggravate these effects or cause an adverse drug reaction. The possible origins of the increased weight loss due to the various drug effects are not established. This drug aids in weight loss in very obese and overweight people with certain health risk factors. One study found that patients who took Adipex-P lost an average of 8.4 pounds over 12 weeks, compared to an average weight loss of 1.4 pounds in the placebo group. In fact, many studies have found that these supplements do not significantly affect weight loss or body composition when compared to a placebo. It has been shown to have potential weight loss benefits by increasing metabolism and reducing body fat. The community offers support, advice, and encouragement to those who are struggling with weight loss. How many mg of phentermine to lose weight?