Avoid drinking alcohol while you are using this medicine. Other side effects include: urinary tract infection, anxiety, blurred vision, depression, dizziness, fatigue, influenza, nausea, increased serum creatinine, and dysgeusia. Instead, check with your doctor. Phentermine (Adipex-P) is a norepinephrine reuptake inhibitor with schedule IV identification (debated in some medical circles) that has been approved by the U.S. Food and Drug Administration (FDA) for short-term use (12 weeks) since 1959. Do not use phentermine if you are also using similar medicines such as benzphetamine, diethylpropion, mazindol, phendimetrazine, Bontril®, or Didrex®. All rights reserved. Consult your healthcare professional (e.g., doctor or pharmacist) for more in formation.These medications may cause some risk when taken together. These side effects may go away during treatment as your body adjusts to the medicine. phentermine and call your doctor if you experience any difficulty breathing, severe chest pain, fainting, or swelling in the legs. Does Phentermine HCL Interact with other Medications? This medicine may cause some people to become dizzy, lightheaded, or less alert than they are normally. Using these medicines together may cause serious unwanted effects. Our general interest e-newsletter keeps you up to date on a wide variety of health topics.It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly and does not cause any unwanted effects. If you think this medicine is not working properly after you have taken it for a few weeks, do not increase the dose. Do not take other medicines unless they have been discussed with your doctor. Side effects include impotence, hives, constipation, dry mouth, and nausea. Commonly reported side effects of phentermine/topiramate include: constipation, insomnia, nasopharyngitis, paresthesia, mood disorder, sleep disorder, and xerostomia. © 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). This medicine may be habit-forming. Check with your doctor if you have any questions. Phentermine, a stimulant similar to amphetamines, acts on the central nervous system to suppress appetite. This includes prescription and nonprescription (over-the-counter) medicines, dietary supplements, herbal remedies, or medicines for appetite control, asthma, colds, cough, hay fever, and sinus problems. From: Integrative Medicine (Fourth Edition), 2018. These may be symptoms of a very serious heart or lung problem. Avoid drinking alcohol while you are using this medicine. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or not alert. "I had a really bad sinus infection that turned into upper respiratory. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.Mayo Clinic does not endorse companies or products. Some side effects may occur that usually do not need medical attention. Consult your healthcare professional (e.g., doctor or pharmacist) for more in formation.These medications may interact and cause very harmful effects. These medications are not usually taken together. The possibility of an association cannot I'm still on Medrol Dose Pack, 2000 mg Augmentin, & Cough Syrup with Coedine.There is no way I'm mixing any of this with my Phen.I haven't gained any weight back and I am yo-yoing between 2-3 lbs. Do not take other medicines unless they have been discussed with your doctor. Consult your healthcare professional (e.g., doctor or pharmacist) for more in formation.Selected from data included with permission and copyrighted by First Databank, Inc. Call your doctor right away if you notice a decrease in your ability to exercise, or if you faint, have chest pain, swelling of your feet or lower legs, or trouble with breathing.