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It will be more effective if started within the first 40 hours of the symptoms, however, in some cases, it is given later to hopefully shorten the duration or lessen the symptoms in high risk cases. It may be helpful and, in most places, there is currently no shortage of the supply of this kind of medication, so you should contact a health care professional even if it is past the first two days to see if it may still be of benefit to try the drug.

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