Sir- I will be happy to to opt out and allow you to await a Psychiatrist to respond, however, I do want you to know that throughout my 35 year career, I worked in conjunction with Board Certified Psychiatrists and I have an extensive background and experience treating patients who are using medications you have been using as well as considerable experience working with patients with Major Depression, Seasonal Affective Disorder with and without light therapy.
Your original question was "Would the latter cause a formerly correct dose of antidepressant to become an overdose?"
The answer is NO and I referenced the risks of Light Therapy and what you can do if you have the side effects mentioned.
As defined in the following medical research, you will these are commonly used approaches (particularly beneficial with Zoloft and Prozac) with benefits of light therapy increasing in many patients to a point where they have reduced need for medication.
(I paste the the specific points so that you don't have to read the entire account but the link is below should you wish to review).
People who have received partial benefit from antidepressants often begin light therapy without changing drug dose. If there is a quick improvement, it is then sometimes possible to reduce the dosage or withdraw the drugs under clinical supervision, while maintaining improved mood and energy. Some patients find a combination of light and drug treatment to be most effective (particularly with Prozac & Zoloft). Some antidepressant drugs and antibiotics, however, are known or suspected to be photosensitizers which may interact with the effect of light in the retina of the eyes. Users of these drugs should therefore check with their medical practitioner or pharmacist before commencing light treatment.
Do lightboxes work for people with major clinical depression, too?
Statistics show that approximately 5-9% of the population suffer from depression. Of those, over half go undiagnosed, and of the remaining half, less than 15% will receive adequate treatment. In an article written by Jeff Kelsey, M.D. recently published in Healthline Magazine, major depression costs the U.S. economy over 40 billion dollars per year, of which only 28% represents the expense of treatment. Females are twice as likely as males to develop depression during their lives, and experience has found that in general, being able to explain a reason for depression is rarely an effective treatment. In the past, antidepressants have been the treatment of choice, often in conjunction with psychotherapy. Where one antidepressant was not enough, two different varieties were often prescribribed to be taken together. Results were not typically seen until the 4th week. Today, however, research is questioning the efficacy of antidepressants altogether after a study by Irving Kirsch, Ph.D., published in Prevention and Treatment, the journal of the American Psychological Association, showed that the beneficial effects of antidepressants only outweighed placebos by 25%. In other words, 75% of the patients responded as well to the placebos as the control group did
to the actual antidepressant. Additionally, a growing number of patients are becoming discontent with the results of their antidepressants. It is thus timely that new research shows light therapy to be a viable alternative to antidepressants, thus providing patients with many new options.
According to Daniel Kripke, MD, director of the Circadian Pacemaker Laboratory at the University of California, San Diego, "Light may produce antidepressant benefits within 1 week, in contrast to psychopharmacological treatments, which typically take several weeks." In a review of clinical trials, Kripke determined that bright light therapy for nonseasonal major depression produced statistically significant net reductions in mood symptoms of about 12-35% on the Hamilton Depression Rating Scale. He noted those results were comparable with those obtained in major trials of antidepressant medications.
Many doctors now recommend patients use light therapy (lightboxes) in conjunction with their antidepressant (notably Prozac and Zoloft) regimen, and they are getting excellent results. "Light and medications appear to work best in combination," Kripke said, adding that combined treatment should also equal lower costs due to faster improvement and less disability.
Light therapy has a strong advocate in Anna Wirz-Justice, PhD, professor of psychiatry at the University of Basel in Switzerland, who is quoted in an article from The Journal of the American Medical Association (JAMA) as saying, "Light is as effective as antidepressant medications are, perhaps more so." Indeed, several European hospitals have already begun to administer light therapy for depression.
A controlled study on nonseasonal depression is currently underway at Columbia-Presbyterian Medical Center in New York City. The study will once again investigate the efficacy of bright light treatment for nonseasonal depression.
For more clinical research information from Dr.Kripke see:
I trust that this will provide further benefit to you.
If you still wish to re-list and get an opinion from a Psychiatrist, feel free to do so , however, I believe I have answered your primary question with a more than acceptable level of competence.