Phentermine is a medicine intended for the treatment of obesity in people for whom simple dieting and exercising do not seem to work. In most cases phentermine is taken for up to six weeks, as addiction to this medicine is possible. If you have been recommended to take this medication for longer than that, make sure you are being monitored by a qualified health care provider for any side effects that are theoretically possible. Phentermine is usually taken once a day with some meals, to make sure it does not make your stomach upset. Phentermine will not help you to lose weight if used alone. Make sure you follow all the dietary recommendations your health care provider gave. It's very important that you let your doctor know about the fact of ever being diagnosed with high blood pressure, overactive thyroid gland, heart disease, diabetes, history of drug abuse, narrowing of the arteries, and glaucoma. These health problems can make the treatment less efficient unless your dose is timely and properly adjusted.

Make sure you notify your doctor of the fact of taking any of the following drugs: paroxetine, sertraline, vitamins, insulin, fluoxetine, depression drugs, medications for weight loss, fluvoxamine, or guanethidine. If you happened to miss a dose you can just take it and then take the next one as usual, unless they are too close in time. In that case just skip the dose missed and take the next one according to the schedule. You can take phentermine at the same time every day – this way you will avoid forgetting about the dose. Phentermine sometimes causes side effects unlikely to last for too long or become bothersome. These include dry mouth, vomiting, diarrhea, unpleasant taste, and constipation. Other more serious side effects can include, but are not limited to: tremor, dizziness, insomnia, shortness of breath, restlessness, chest pain, swelling of the legs and ankles, heart palpitations, and dizziness. In case of being allergic to phentermine or any other medicine, talk to your doctor about the upcoming treatment to find out how safe it is going to be. Being allergic to some other products can also prevent you from taking phentermine safely.