It should be pretty straight forward. If you receive a script that is for "Expectant Partner" tell the individual presenting the prescription that you have to have a name and allergy history for the individual receiving the medication. The young lady presenting the script (it's usually women that are seen at Planned Parenthood clinics) can tell you the script is for John Holmes, Tony the Tiger, or any name she chooses. If she doesn't know about Mr. Wonderful's allergy history then write on the script NKDA. Presto, you are covered and "Expectant Partner" gets his medication.
If Planned Parenthood wants to double the medications under one name that's fine, whether the insurance will cover high amounts of antibiotics with a 1 day supply is an entirely different story. If Planned Parenthood wants to put "Take as directed" for the directions that's fine as well. All you have to do is get a standing order from the NP at Planned Parenthood saying the medication is to have an X number of days supply. If the naughty NP decides to lie and say the course of therapy is for a longer duration than it actually is then she can discuss that with the insurance company during an audit. In either case you're ok.