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 What Doctors Don't Tell You: Nicorandil 
What Doctors Don't Tell You © (Volume 13, Issue 7)
Nicorandil, marketed in the UK as Ikorel, is a powerful potassium-channel activator to treat angina pectoris (severe chest pains), and a recent study suggests it is a very effective one. As a result, it’s increasingly being used as a first-line treatment.

Unfortunately, the sharper the sword, the greater the risk you run of getting cut. The study that concluded that the drug was most effective for people with stable angina also admitted that 66 per cent of those in the trial had to stop treatment because the adverse reactions were so severe. Most complained of very bad headaches (Lancet, 2002; 359: 1269-75). By any reckoning, this is an astonishingly high failure rate.

Now, doctors at Aberdeen’s Royal Infirmary also suspect the drug can cause anal ulcers. They noticed that five patients suddenly developed the ulcers while taking the drug. The ulcers disappeared almost immediately after stopping treatment (Lancet, 2002; 360: 546-7).

Their findings tie in with an earlier discovery that nicorandil causes mouth ulcers. These were first noted in 1998, when 25 cases of severe ulcers were reported; in some cases, the ulceration was so bad that it affected eating and talking. Again, the ulcers disappeared when the drug was stopped.

Doctors should also be on the lookout if they are prescribing nicorandil with other heart drugs. Researchers at Addenbrooke’s Hospital in Cambridge have also found that it interacts badly with antidiabetic drugs, such as glibenclamide and glimepiride. The cocktail effect can cause serious reactions and makes it ineffective. A better choice with nicorandil is gliclazide, the researchers concluded.

Aside from headaches and ulcers, other reactions have included dyspepsia, nausea, vomiting, anorexia and dizziness. A fall in blood pressure and an increase in heart rate have been noted at high doses.

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What Doctors Don't Tell You What Doctors Don’t Tell You is one of the few publications in the world that can justifiably claim to solve people's health problems - and even save lives. Our monthly newsletter gives you the facts you won't......more
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