BRAIN tonics have proliferated in Pakistan. A report by the Association for the Rational Use of Medication has identified 20 brain tonics in Pakistan, which are freely promoted for a variety of ailments such as dizziness, memory loss, cerebrovascular impairments, and mental and physical retardation. However, the report warns that the therapeutic value of these drugs -- sold under brand names such as Hydegine, Sermion and Loftyl -- doubtful and they could also prove toxic.