No. There are over 200 types of mental disorders as per the World Health Organisation’s (WHO) International Classification of Diseases (ICD 11th edition). The majority of common mental disorders require only short-term medications. A very few challenging mental disorders, like chronic schizophrenia, only require long-term medication. Since science is always advancing, there can be break-through treatments acquired. So, we cannot and need not use terms like "lifelong."