Zoloft vs. Viibryd
See how Zoloft and Viibryd compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Zoloft is FDA-approved for six conditions, including major depression, OCD, panic disorder, PTSD, PMDD, and social anxiety disorder, while Viibryd is approved only for major depressive disorder in adults.
Both drugs raise serotonin levels, but Viibryd also activates a serotonin receptor (5-HT1A) and must be taken with food, while Zoloft can be taken with or without food.
Generic sertraline is widely available and inexpensive, while Viibryd has no widely available generic and typically costs more out of pocket.
Zoloft vs. Viibryd Drug Summary
Zoloft
Zoloft (sertraline) is an SSRI antidepressant approved for major depressive disorder, OCD, panic disorder, PTSD, social anxiety disorder, and PMDD. It comes as a tablet or oral solution taken once daily, with the dose increased weekly if needed.
Viibryd
Viibryd (vilazodone) is an SPARI antidepressant approved for major depressive disorder in adults. It is a tablet taken once daily with food, with the dose raised over two weeks to reach the target maintenance level.
Zoloft vs. Viibryd Side Effects
Zoloft
Viibryd
Zoloft vs. Viibryd Dosage
Zoloft
Viibryd
| STAGE | DOSE | WHEN |
| Starting dose | 25-50 mg once daily | Day 1 |
| Maximum dose | 50-200 mg once daily | If needed |
| Dose changes | 2 increases | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Days 1-7 |
| Maximum dose | 40 mg once daily | Day 15 onward |
| Dose changes | 2 increases | Every 7 days |
Zoloft
| STAGE | DOSE | WHEN |
| Starting dose | 25-50 mg once daily | Day 1 |
| Maximum dose | 50-200 mg once daily | If needed |
| Dose changes | 2 increases | As tolerated |
Viibryd
| STAGE | DOSE | WHEN |
| Starting dose | 10 mg once daily | Days 1-7 |
| Maximum dose | 40 mg once daily | Day 15 onward |
| Dose changes | 2 increases | Every 7 days |
Zoloft vs. Viibryd Indications
Zoloft
Zoloft is FDA-approved for major depressive disorder, OCD, panic disorder, PTSD, social anxiety disorder, and premenstrual dysphoric disorder. It is sometimes used off-label for generalized anxiety disorder and other conditions, which is not an FDA-approved use.
Major depressive disorder (MDD)
Obsessive-compulsive disorder (OCD)
Panic disorder, PTSD, and social anxiety disorder
Premenstrual dysphoric disorder (PMDD)
Viibryd
Viibryd is FDA-approved only for major depressive disorder in adults. It is not approved for pediatric depression, anxiety disorders, or OCD, though clinicians sometimes prescribe it off-label for these conditions.
Major depressive disorder (MDD) in adults
Not approved for pediatric depression
Not FDA-approved for anxiety disorders or OCD
Sometimes used off-label for other conditions
Zoloft vs. Viibryd Pros and Cons
Zoloft
Zoloft is one of the most widely prescribed SSRIs, with FDA approval across six different conditions and decades of real-world use. Its main trade-offs are sexual side effects and dose titration that can take several weeks depending on response.
Pros
FDA-approved for six conditions, not just depression, including OCD, panic disorder, PTSD, and PMDD
Available as a low-cost generic (sertraline), unlike Viibryd's brand-only pricing
Can be taken with or without food, with no strict meal requirement
Cons
Sexual side effects, including ejaculation failure in up to 14% of patients, are among its top reactions
Dose increases follow a flexible weekly schedule with no fixed endpoint, which can extend titration
Slightly higher nausea rate in trials than Viibryd (up to 25% vs up to 23%)
Viibryd
Viibryd works differently than standard SSRIs, pairing reuptake inhibition with partial activation of a serotonin receptor, but it is approved only for adult depression. It requires food for proper absorption and has no low-cost generic, and its most common side effects are gastrointestinal.
Pros
Combines serotonin reuptake inhibition with partial 5-HT1A agonism, a mechanism distinct from standard SSRIs
Fixed two-week titration schedule to reach the target maintenance dose
Sexual side effects like ejaculation failure are not among its top four reported reactions
Cons
Only FDA-approved for major depressive disorder in adults, a narrower range than Zoloft
Must be taken with food, since absorption drops significantly without it
No widely available generic, with brand pricing of $380 to $650 a month versus Zoloft's low-cost generic option
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