This is wrong. In the book Soma is described to have roughly the positive effects of alcohol, without the negative consequences.
Soma is described as being able to take a few grams and experience an eternity of time within a few hours. It sounds more like an intense psychedelic.
The term you are looking for is trance. Think of those manic church sessions, where people feel all so connected to god and go stark raving mad. Psychedelic trance can be achieved playing music or through meditation, as well.