Here are some of the disadvantages of group therapy:
Group therapy is not suitable for people with shyness or social anxiety disorders. Such people can be overwhelmed by the attention, especially if they are dealing with trauma.
Group therapy can be less effective if members experience personality clashes. These clashes can be a distraction from the main objective of the program.
It can be extremely difficult to guard confidentiality in a group setting. Even if all participants agree not to share private information, there is always a risk that somebody will violate the pact.
Group sessions can undergo scheduling challenges.
Group therapy reduces intimacy between the client and the therapist by sharing the therapist's attention with other people. This may reduce the effectiveness of the treatment.
Group therapy encourages social loafing, where some participants ride along without actively participating in the therapy.