Salts of a bicyclic, N-acylated imidazo-3-amine or an imidazo-5-amine of the formula: addition products thereof with acids, and methods for preparing the salts and addition products. Also disclosed are pharmaceutical compositions comprising the same and methods using the pharmaceutical compositions for the treatment or prophylaxis of pain, drug or alcohol abuse, diarrhoea, gastritis, ulcers, urinary incontinence, depression, narcolepsy, overweight, asthma, glaucoma, tinnitus, itching, hyperkinetic syndrome, epilepsy, or schizophrenia, for inducing anesthesia, and for anxiolysis.