With the second plateau (around 2.5-7.5 mg/kg, 6.4 mg/kg suggested from regular users) several new effects become evident. The most profound is that DXM begins to take on a heavier "stoning" characteristic, and senses and cognitive function are affected accordingly. Closed-eye hallucinations start for some people on the second plateau. Some of the first plateau effects, e.g., the music and motion linked euphoria, may diminish or stop entirely.
Second plateau trips usually take between 30 and 60 minutes to start (on an empty stomach), peak about 2 to 3 hours later, and last about 6 hours. Again, gel capsules take up to 1 hour additional to dissolve. Hangovers are not common with lower second plateau trips, but some people experience them.