It is always wisest to check any proposed changes in dosage of any drug, with your prescribing and treating doctor. 20 mg is usually the minimum dose for Cilift ( citalopram ) ; 40 mg is a common dose, and even a bit higher. But I would prefer it if GPs did not automatically give repeat prescriptions for any drug "for years" without periodically re-assessing the person to see if they still need it, or maybe a different treatment. So discuss this with your doctor, and let him re-assess you and your condition and diagnosis.
Depending on the nature of the current "stressfulness" it might be more useful to change to treatment by your seeing a counselor to learn how to cope better with whatever is stressing you.
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