ssri
Synonym discussion
Sense: noun/1
SSRI is a specific kind of antidepressant, so the two terms are related but not equal. Antidepressant is the umbrella word for medicines used to treat depression; an SSRI is one common subtype, often also prescribed for anxiety. An SNRI is close in purpose, but it affects serotonin and another chemical, norepinephrine, so doctors may choose it for different symptom patterns. A sedative is different again: it mainly calms the body or makes sleep easier, rather than naming the same long-term treatment class. So a doctor may say, 'Let's try an SSRI,' but a patient might describe it more generally as 'an antidepressant.'
Common collocations
Etymology
SSRI is an initialism from modern medical English: selective serotonin reuptake inhibitor. The name describes how the medicine works. It selectively slows the reuptake of serotonin, which leaves more of that chemical available between nerve cells. In everyday use, speakers usually say the letters one by one and then treat the term as a countable noun, as in 'an SSRI' or 'two SSRIs'.
First known use
1991
1991, in the meaning defined above