Possibly so. Lexamil is a trade name for the drug Escitalopram, a popular antidepressant. Depression itself can cause a lower sex drive, and so do many of the antidepressant drugs now available. None of them cause this side-effect in everyone who takes them, some do so only rarely. So do discuss this with your doctor, as you may well be better suited by a different drug, which may not affect you in this way.
You don't mention how long you have been taking the drug, as most drugs show their side-effects more in the first few weeks, and then they usually diminish.
To use an antidepressant properly, once you have found one that suits you, it's important to remain on it for around 9 months, as if one stops earlier, even if feeling fine, there's an increased risk of a relapse of the depression.
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