I have a 10 year old son,for last 1 month plus he is suffering from cold and nose blockage with thick mucus enimating some times,as being a child he is feeling lot uneasyness ,the virus doesnot seem to vanish with lot of treatments,yesterday one of the pediatrician advised one tablet of pentids 400 for 6 days,and otirivin nasal spray . please advise is the above medicine safe for the child and what are the remidies we should follow to arrest this.