Arizona Sexual Experiences Scale (ASEX)

A total ASEX score ≥19 is considered clinically significant sexual dysfunction. Scores 5–18 suggest minimal dysfunction. Change from baseline is also important: an increase of 3+ points after starting a medication suggests medication-induced effect. However, clinical judgment is essential; ASEX score alone does not determine treatment decisions.

Sexual function typically begins to improve 1–2 weeks after SSRI/SNRI dose reduction or medication switching. Measurable ASEX score improvement (3–5 point reduction) is often seen by 4 weeks. Full recovery may require 8–12 weeks. Speed of improvement varies based on the specific medication, dose, and individual factors.

ASEX was developed for medication-induced sexual dysfunction screening and is most reliable in that context. For primary sexual dysfunction (unrelated to medications), longer, more detailed measures (FSFI, IIEF) are preferable. ASEX can provide screening information but should be supplemented with detailed sexual history if primary dysfunction is suspected.

Depression itself impairs sexual desire, arousal, and satisfaction; elevated ASEX in a depressed patient may reflect depression rather than medication side effect. Distinguishing the two requires clinical judgment: Did ASEX elevate after medication initiation (suggesting medication effect), or was ASEX high at baseline due to depression? As depression improves with adequate medication, ASEX may improve despite continued antidepressant use, supporting a depression-driven mechanism.

Interpretation is more complex when patients are on multiple psychiatric medications, each potentially affecting sexual function. ASEX provides an aggregate sexual dysfunction score but cannot attribute causation to specific agents. Clinical history (which medication was started first, temporal relationship of ASEX elevation to specific medication changes) helps narrow etiology. Trial of dose reduction or switching one agent at a time may be needed to identify the culprit.