There is no single best medicine for psoriasis. The right treatment depends on how much of your body is affected, where it shows up, and how it responds over time. For mild cases covering a small area, a topical steroid cream may be all you need. For moderate-to-severe psoriasis, newer injectable biologics that target specific parts of the immune system now deliver the highest clearance rates, with some patients achieving completely clear skin.
Topical Treatments for Mild Psoriasis
If psoriasis covers a relatively small area, topical medications applied directly to the skin are the standard starting point. Corticosteroid creams and ointments are the most frequently prescribed option for mild-to-moderate psoriasis. They come in a wide range of strengths: mild formulas like hydrocortisone work well for sensitive spots like the face or skin folds, while stronger prescriptions are reserved for thicker, stubbornly scaly patches on elbows, knees, or the lower back. During flares, you typically apply them once daily, then taper to a few times a week to maintain results.
Synthetic vitamin D creams slow the overproduction of skin cells that causes plaques to build up. They can be used alone or layered with a corticosteroid for a stronger effect. Retinoid creams (applied once or twice daily) and calcineurin inhibitors are other prescription options, with calcineurin inhibitors being particularly useful around the eyes and other thin-skinned areas where steroids can cause damage over time.
Over-the-counter options include salicylic acid, which softens and lifts thick scales so other treatments can penetrate, and coal tar, which reduces itching and inflammation. Coal tar is available in shampoos, creams, and oils, though it’s used less commonly today than it once was.
Scalp and Hard-to-Treat Areas
Scalp psoriasis often requires specialized formulations because creams and ointments don’t work well in hair. Medicated shampoos containing a potent corticosteroid can be used daily for up to four weeks, then once or twice a week for maintenance. If you have thick, crusted plaques, a salicylic acid scale softener applied beforehand helps the medication reach the skin underneath. Vitamin D creams applied at bedtime under a shower cap and retinoid gels rinsed off in the morning are also effective for stubborn scalp patches.
Phototherapy for Moderate Psoriasis
Light therapy, or phototherapy, uses controlled doses of ultraviolet light to slow skin cell turnover. Narrowband UVB is the most common form and typically requires two to three sessions per week at a clinic or with a home unit. Across multiple studies, about 62 to 70% of patients achieve at least a 75% improvement in their psoriasis with narrowband UVB alone. A more intensive option, PUVA (which combines a light-sensitizing medication with UVA light), clears psoriasis in roughly 80% of patients and requires fewer total sessions, around 17 compared to 25 for narrowband UVB. The tradeoff is a slightly higher long-term risk from the sensitizing medication, so PUVA tends to be reserved for cases that don’t respond to UVB.
Phototherapy works well as a standalone treatment or combined with topicals. It’s a good middle ground for people who want to avoid systemic medications but aren’t getting enough relief from creams alone.
Oral Systemic Medications
When psoriasis is too widespread for topicals or phototherapy, oral medications that work throughout the body are the next step. Methotrexate, one of the oldest systemic options, is effective but generally less so than the newer biologics. Cyclosporine works quickly for severe flares but isn’t meant for long-term use.
Two newer oral options have expanded the choices. Apremilast works by blocking an enzyme involved in inflammation and is taken as a daily pill. It’s a reasonable option for moderate psoriasis, though its clearance rates are modest compared to biologics. A newer oral drug, deucravacitinib, targets a specific signaling molecule (TYK2) involved in the immune pathways that drive psoriasis. In clinical trials, about 58% of patients on deucravacitinib achieved at least 75% skin improvement at 16 weeks, compared to 35% on apremilast and 13% on placebo. For people who prefer a pill over an injection, deucravacitinib currently offers the strongest oral results.
Biologics: The Most Effective Option
For moderate-to-severe psoriasis, biologic injections represent the biggest leap in treatment over the past two decades. These are lab-made proteins that block specific immune system signals responsible for the rapid skin cell growth in psoriasis. They don’t suppress the entire immune system the way older drugs do, which makes them more targeted.
Biologics are grouped by what they block:
- TNF blockers (adalimumab, infliximab, etanercept, certolizumab) were the first generation. They’re effective, and biosimilar versions are now available as interchangeable, lower-cost alternatives.
- IL-17 blockers (secukinumab, ixekizumab, brodalumab) represented a significant step up, achieving higher rates of near-complete and complete skin clearance than TNF blockers in head-to-head trials.
- IL-23 blockers (guselkumab, risankizumab, tildrakizumab) are among the newest and most effective, with the added advantage of less frequent dosing. After initial loading doses, some IL-23 blockers are injected only every 8 to 12 weeks, and real-world data suggests some stable patients can stretch intervals even longer.
- IL-12/23 blockers (ustekinumab) fall between TNF and IL-17/IL-23 blockers in effectiveness. Multiple biosimilar versions were recently approved as interchangeable products, making this a more affordable option.
The IL-17 and IL-23 blockers consistently produce the highest clearance rates. Clinical trials for these newer agents have shifted the goal from 75% improvement to 90% or even 100% clear skin, outcomes that were essentially unheard of a generation ago. Patients who reach near-complete clearance report significantly better quality of life and less itching than those who achieve only partial improvement.
How Dosing Schedules Differ
One practical factor that matters to many people is how often they need to take their medication. Biologics vary considerably. Some require an injection every two to four weeks, while IL-23 blockers can stretch to every 8 or 12 weeks after the initial loading period. Surveys show that most patients prioritize how well a drug works over how often they inject, but those on every-four-week schedules do tend to wish for less frequent dosing. If convenience is important to you, this is worth discussing when choosing between options with similar effectiveness.
Cost and Accessibility
Biologics are expensive. The average annual cost of biologic treatment in the U.S. rose from about $21,200 in 2007 to $47,100 in 2021, with individual drugs ranging from roughly $12,400 to $70,000 per year. The arrival of biosimilars, particularly for adalimumab and ustekinumab, is beginning to lower costs. One analysis found that if patients started on the lowest-cost drug in each biologic class, average annual spending would drop by 44%. Insurance coverage, manufacturer copay programs, and biosimilar availability all play a role in what you’ll actually pay out of pocket.
Safety and Monitoring
Before starting a biologic, you’ll typically get baseline blood work including a complete blood count, liver function tests, and screening for hepatitis and tuberculosis. Repeat blood tests are generally recommended every three to six months, or more frequently if you have risk factors for liver problems.
The main safety concern with biologics is a modestly increased risk of infections, since they partially dampen immune responses. Serious infections are uncommon but possible, and tuberculosis screening is done annually for patients on TNF blockers in particular. Other rare but monitored risks include changes in blood cell counts and liver enzyme elevations. The newer IL-17 and IL-23 blockers have generally shown safety profiles comparable to the older TNF blockers while delivering better results, which is a large part of why they’ve become preferred first-line biologics for moderate-to-severe disease.
Combining Treatments
Many people use more than one treatment at a time. Topical steroids or vitamin D creams are commonly added on top of a biologic or oral medication to manage stubborn spots or flares in specific areas. Phototherapy can also be paired with topicals or certain systemic drugs. This layered approach lets you use lower doses of each individual treatment while still achieving good clearance, and it’s specifically supported by joint AAD and National Psoriasis Foundation guidelines as a standard strategy.