If you look at a 1.6 system (say the current demo system) a medication entry on the Patients|Medical Records|Summary pages displays as:

However, on the 1.7 systems it displays as

The description node in the act.patientMedication archetype looks good, it is

 concat(openvpms:get(.,'product.entity.name'), ' - ','Qty : ',/details/quantity,' Expiry : ', date:formatDate(/activityEndTime)) 

No sign of an inserted newline there so something must be going wrong with the formatting of /details/quantity

Regaards, Tim G