What does p.r.n stand for?

p.r.n stands for "When required"

How to abbreviate "When required"?

"When required" can be abbreviated as p.r.n

What is the meaning of p.r.n abbreviation?

The meaning of p.r.n abbreviation is "When required"

What does p.r.n mean?

p.r.n as abbreviation means "When required"