The excitement has been hard to miss. Last week Britain’s medicines regulator approved the world’s first weight-loss tablet – the Wegovy Pill.The response was immediate. Online pharmacies have reported that they expect to have waiting lists of more than 100,000 patients who want to start taking the daily tablet, which will only be available privately at first.At first glance, this excitement seems reasonable. At present, weight-loss drugs such as Wegovy and Mounjaro have to be self-injected, a task that many people find off-putting. The tablets are also expected to be roughly £40 less a month than the injections. No wonder then that, according to polling published last week, twice as many Britons say they would take a weight-loss pill than a jab.However, I’m concerned that many patients are unaware that the Wegovy Pill is not the easy alternative that it appears. In fact, the vast majority of patients would be better off sticking with the injections.To explain why, it’s important to understand how this drug works.The Wegovy Pill contains semaglutide, the same drug that made the Wegovy injections famous. It works by mimicking a hormone called GLP-1, which your body releases naturally after eating. This makes you feel fuller for longer, reduces hunger and curbs cravings.The reason semaglutide has always been given as an injection is that, taken orally, the drug is normally destroyed by stomach enzymes before it can reach the bloodstream. The Wegovy Pill - the tablet form of the once-weekly Wegovy injection - has been greenlit by health officials.The tablet gets around this with a special compound that briefly neutralises stomach acid and protects the drug long enough to be absorbed.The science behind the formulation of this drug is ingenious – but it has its limits.For one thing, it is markedly less effective than the most powerful injections. The Mounjaro jab typically triggers around 22 per cent weight-loss for obese patients.By comparison, studies show the strongest dose of the Wegovy Pill leads to, at most, 17 per cent weight-loss, a meaningful result but one that falls short of Mounjaro.This is all the more significant when you consider the fact that these are averages meaning that many patients who go on Mounjaro do not reach this amount. It’s common for patients to reach a weight plateau – where the jabs seem to stop having an effect.Of course, any weight loss if you have obesity is good for your health, but it’s a frustrating experience and, with the pills, this plateau may occur even earlier.Then there are the side-effects. While taking a daily pill may seem less intensive than self-injecting, the risk of complications is the same.Regardless of which form of Wegovy patients take, they should expect to experience some uncomfortable symptoms including nausea, diarrhoea, abdominal pain, constipation and vomiting, particularly when starting or after the dose is increased.Which brings me to my biggest concern about this drug. The Wegovy Pill has been pitched as a convenient and easy-to-use alternative to injections. However, it is far from it.It cannot simply be swallowed with your morning coffee or alongside other medication.