I guess if you have real trouble this is available:
There are many types of erectile dysfunction injections. Here, we review some of the best erectile dysfunction injections a doctor can prescribe.
www.medicalnewstoday.com
Just be aware for high dosage, the effect can last + 4 hrs...... so no quicky and then going back to work.
Apparently mattress actors use it for 6 to 8 hr shoots.