This article is an interesting read, particularly at a time when seasonal colds are doing the rounds. It suggests that there should be a review of nasal decongestants currently on sale in the UK as some could cause a serious brain defect. The products which could be a risk contain pseudoephedrine which helps relive nasal congestion.
It could in rare cases cause two brain blood vessel conditions – posterior reversible encephalopathy syndrome (PRES) and reversible cerebral vasoconstriction syndrome (RCVS). RCVS can cause sudden headaches that often recur over a span of days to weeks, whilst symptoms of PRES may include blurred vision, headache, seizures and confusion.
Any side effects can be reported to the Medicines and Healthcare Products Regulatory Agency (MHRA) which is currently reviewing the evidence and conducting a safety review into the products on sale.