If you or your spouse is depressed there are some studies that support the idea that couples therapy may help more than other treatments. In a study done in 2012 Dessaullesa, Johnsona, and Dentonb found that when one spouse is depressed and the relationship is also under stress couples therapy may outperform antidepressants. Leff et al. in the British Journal of Psychiatry (2000) found that partner's depression improved after either couples therapy or antidepressant medication. However the couples therapy group continued to show those gains at a one year follow up while those treated with medication did not.
In summary if you find yourself depressed, or if your partner is depressed, and your relationship could use some attention as well you may get more benefit from couples therapy than medication or other interventions like individual therapy. It's important to remember that depression has very serious health consequences as well as emotional pain and should be treated or it can worsen.
With warm wishes,