Hello
Thanks for using DoctorSpring.com for posting your query.
I have gone through your question in detail and I can understand what you are going through.
Coming to your first questions directly, there is no harm in taking oxapax 7.5mg and viagra 100mg together.
Now my suggestions:
1) If you have performance anxiety then propranolol can be more effective and safe than the oxapax. Oxapax has a possibility of addiction in future and one needs to be careful.
2) The dose of viagra 100mg is slightly high and if required it may be used in the dose of 50mg and may not be required any further. Also if your anxiety gets reduced with oxapax/propranolol, you may not require the use of viagra at all.
Hope this helps,
In case if you have any further query, do let me know.
Kind regards
Dr. Srikanth Reddy