“They help you suppress your appetite by stimulating your central nervous system and therefore reducing your appetite,” she says. The FDA has approved other stimulant medications for weight management, such as :Īppetite suppressants are meant to be used along with exercise and diet to help you lose weight, explains Sabrina Barata, MD, a primary care doctor at Mercy Personal Physicians at Lutherville in Maryland. Phentermine isn’t the only stimulant appetite suppressant medication out there. How does caffeine affect people on appetite suppressants? “The more that you take, the more symptoms of caffeine excess or stimulant excess the person may have,” she explains. It’s possible there is a dose dependent impact when it comes to mixing phentermine and caffeine. “A Starbucks quadruple espresso has much more caffeine than a cup of green tea,” says Dr. It’s also important to remember that not all caffeine sources have the same amount of caffeine in them. “I would really advise that people drastically cut back, and they probably won’t even feel like they need caffeine when they are taking phentermine,” she explains. There are no set rules about how much caffeine you can consume with phentermine, says Dr. How much caffeine can you have with phentermine? (Topamax, a single-ingredient drug that contains the active ingredient topiramate, is used to treat certain types of seizures.) However, she notes that there isn’t any research showing that caffeine decreases the effectiveness of topiramate when it comes to appetite suppression. “This is especially problematic if you take topiramate for seizures,” she says. As such, if you are taking topiramate along with phentermine, you may be wondering if you can consume caffeine.Īccording to Erika Gray, Pharm.D., chief medical officer and co-founder of Toolbox Genomics, there is some research indicating caffeine interacts with topiramate by making it less effective. In 2012, the FDA approved a combination drug called Qsymia, which contains phentermine and topiramate, to be used as an appetite suppressant. Phentermine is often combined with topiramate to maximize effects in people looking to lose weight. “I would expect that someone who is using phentermine and also chooses to take caffeine will have a very high blood pressure and heart rate, likely palpitations, have trouble with sleeping, and will likely have racing thoughts and a dry mouth,” Dr. Purdy says, is because both phentermine and caffeine stimulate the nervous system, and if combined together, you could potentially experience intense side effects. There is little published data out there to answer questions like, “Can you drink coffee with phentermine?” But in theory, phentermine and caffeine could interact with each other, says Laura Purdy, MD, a board-certified family medicine physician. RELATED: Is phentermine for weight loss safe? Do phentermine and caffeine interact? Phentermine doesn’t have caffeine in it, but like caffeine, it’s a stimulant, and has many of the same side effects as caffeine. If you’re wondering how much caffeine is in phentermine, the answer is zero. The medication is usually combined with other weight loss strategies such as calorie reduction and exercise.
It’s often used to help overweight or obese people who are having trouble losing weight. Phentermine is a medication that can suppress your appetite. Let’s take a look at what happens when you mix phentermine and caffeine, and whether you can drink caffeine while taking phentermine. Is it possible that combining phentermine and coffee will have some unpleasant-or even harmful-side effects? How about tea, soda, or other forms of caffeine? After all, phentermine is a stimulant and can have some of the same side effects as caffeine, such as rapid heartbeat and jitteriness. If you are someone who takes phentermine for weight management, you might be wondering if it’s okay to have a cup of coffee every now and then.
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