thanks guys ... there may not be many people on our cosy site here but answers to questions still come very quickly.
you see, a friend has bouts of chronic back pain and is reluctant to take this pain killer as he is prescribed the T(ri)C(yclic)A(ntideppresant.), Endep. ... anyhow - he has opiophobia for some valid, deeply personal reasons.
yes, opiophobia exists.