The phrase "a dangerous side effect" is correct and usable in written English.
It can be used when discussing potential negative consequences of a medication, treatment, or action.
Example: "Before starting the new medication, the doctor warned me about a dangerous side effect that could occur."
Alternatives: "a harmful consequence" or "a serious adverse effect".
It is a dangerous side effect.
The war on terror and the growth of big government have had a dangerous side effect: the loss of privacy rights for the American people.
In particular, studies by the companies have found the Cox-2 inhibitors lower the risk of developing ulcers, which in rare cases can be a dangerous side effect of anti-inflammatory pain relievers like aspirin and ibuprofen.
The companies have said the new drugs are worth their high price because they are safer for the stomach and appear to cause fewer ulcers, a dangerous side effect of anti-inflammatory pain relievers like ibuprofen and aspirin.
The company last month announced that because of a dangerous side effect, it would halt one late-stage study of the drug and remove some patients from a second study that continues.
Aspirin can thin the blood, a dangerous side effect in patients already undergoing toxic chemotherapy.
If the optimal design for gas exchange has a dangerous side-effect, says Hiroko Kitaoka of Osaka University in Osaka, Japan, perhaps Savopal and his colleague's quantitative approach can find the best compromise.
But he warned me about a potentially dangerous side effect of a broken nose called a septal hematoma.
Recent research at Harvard and Berkeley has just revealed a very dangerous side effect of pulling an all-nighter – short term euphoria.
Scientists have developed a new sleep medication that has induced sleep in rodents and monkeys without apparently impairing cognition, a potentially dangerous side effect of common sleep aids.
The increased levels of bradykinin are thought to cause the pruritus, which is usually a precursor to a much more dangerous side effect, angioedema [ 84, 85].
