Reference: Duroos wa Fataawa al-Hajj – Volume 1, Page 11, No.2
Question: I use medication specific to the pain in my back. So is it permissible to use it whilst in the state of ihraam?
Response: There is no harm in using medication whilst in the state of ihraam. That is because [the use of] medication is not prohibited for the one in the state of ihraam, whether or not [the medication is] tablets, or liquid, or non-scented oil/cream – in which case there is no harm [in using it].