vicodin or momentum?

My husband has been taking vicodin for some back pain.  Someone else told us about over the counter Momentum.  Can he take BOTH, or should he take one or the other?

[tanglewood]

Interactions between your selected drugs
hydrocodone (Ingredient of Vicodin) and phenyltoloxamine (Ingredient of Momentum) (Moderate Drug-Drug)

MONITOR: Central nervous system- and/or respiratory-depressant effects may be additively or synergistically increased in patients taking multiple drugs that cause these effects, especially in elderly or debilitated patients.

MANAGEMENT: During concomitant use of these drugs, patients should be monitored for potentially excessive or prolonged CNS and respiratory depression. Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.