Phentermine is a prescription medication that is used to aid in weight loss. It dampens the appetite, lessens cravings and promotes energy, all of which are helpful for weight loss. Phentermine, available under the brand names Ionamin and Adipex-P, can aid in weight loss, but it does cause side effects in some people. It is important to understand what to expect when taking phentermine.
Minor Side Effects
Some side effects of phentermine are not severe, and may only cause minor discomfort or annoyance. It is up to the person taking phentermine to determine if the side effects are severe enough to cause them to discontinue taking the medication. While annoying, these side effects do not cause any long-term problems and are not dangerous. They include a dry mouth or an odd taste in the mouth, feeling anxious or nervous, mild headache, restlessness, trouble sleeping and constipation. Lifestyle choices reduce some of these side effects, such as taking the medication early in the day to reduce sleep problems, drinking plenty of water to reduce constipation and exercising to reduce feelings of anxiety or restlessness.
Dangerous Side Effects
Some side effects of phentermine are more serious. People that experience any of these side effects should discontinue taking the medication and speak with their physician. Chest pain or feeling like you may pass out are both reasons to stop taking phentermine. Changes in your heart rate, such as developing an irregular or rapid heartbeat, are another concern. Phentermine can lead to a dangerous spike in blood pressure. Signs of high blood pressure can include a severe headache, buzzing in the ears, blurry vision, chest pain, trouble breathing and confusion. High blood pressure can also lead to seizures.
Other Concerns
Phentermine diets can have side effects not directly related to the medication. Some people find that the appetite suppressant quality of phentermine is effective enough that they have trouble eating at all. For the average dieter, this lack of appetite is welcome, but can lead to complications. Weakness, difficulty concentrating and even passing out can all occur in people who don't eat enough, particularly if they are also exercising. People who experience this level of appetite suppression from taking phentermine should discuss with their health care provider the effectiveness of taking a smaller dosage or half of a pill. Generally, the extreme level of appetite suppression wears off as the body becomes accustomed to the medication.
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