Basically because you need a certain concentration in your blood before they can take effect which takes a while to get to. Also most psychiatrists will recommend starting at a relatively low dose and working your way up to a therapeutic dose because psych meds are notorious for having lots of side effects. Both of these add up to long times for full effects to take hold. In cases where a person may need holding over short term anti anxiety meds can be used until the antidepressants have time to kick in. Remember it’s a slow delicate process to coax brain chemistry to where it needs to be.
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