Reword the following paragraph
If sofosbuvir is used in combination with peginterferon alfa, and a patient has a serious adverse reaction potentially related to this drug, the peginterferon alfa dose should be reduced or discontinued.
The dose of peginterferon alfa may need to be reduced, or administration discontinued when sofosbuvir is used in combination with peginterferon alfa and the patients experience severe side effects that are possibly associated with that medicine.