It can be divided in several doses or administered as a continuous infusion.

When a catheter is placed into the epidural space (see below) a continuous infusion can be maintained for several days, if needed.

For a prolonged effect, a continuous infusion of drugs may be employed.

Injection nerve blocks can be either single treatments, multiple injections over a period of time, or continuous infusions.

Our country has always been dependent on a continuous infusion of immigrants.

In studies up to 72 hours of continuous infusion, there was no evidence of tolerance.

It is administered by intermittent injections or continuous subcutaneous infusions.

A little more than a tenth of a pint must be given in a carefully regulated continuous infusion over a period of 24 hours.

It may also be administered by continuous infusion over 4 hours.

From the short description given, I wonder why a person with "intermittent" pain was placed on a continuous infusion of morphine.