- Topical Therapy
Topical therapy is the most frequently used treatment by doctors today. There
are two types of topical treatments that can be used for psoriasis; steroidal creams
and non-steroidal creams.
Topical steroids contain synthetic cortisone which is an anti-inflammatory agent
to reduce redness and swelling. Patients using topical steroids should follow doctors’
instructions closely to prevent thinning of the skin, easy bruising and stretch
marks.
Examples of non-steroidal medications are tar, salicylic acid, topical retinoids,
Tazorac and Dovonex which are derived from vitamin A and D respectively. Tar can
be bought over the counter and is used to help slow rapid skin cell growth, and
help reduce itching and scaling. Like tar, salicylic acid can be purchased over
the counter and is used to shed scale. Both tar and salicylic acid can be prescribed
as compounds combined with other topical therapies. Tazorac and Dovonex need to
be prescribed by a physician, these agents help to remove scale and flatten the
psoriatic lesions.
Topicals come in creams, ointment, lotions, solutions and gels. Ointments are given
more frequently since they are more occlusive and tend to work better. Lotions and
gels may be used in hair bearing areas to allow for easy application.
- Phototherapy
Light treatments work by penetrating the skin to slow the rapid skin cell growth.
Light treatments are most commonly administered in the physician’s office however,
in some special cases, it is possible for the doctor to prescribe a light unit for
home use. UVB is the most common light used. The most common side effects include
a sunburn type reaction, slight increased risk of skin cancer and increased dryness
and itching. There are two forms of UVB lights used to treat psoriasis, broadband
(BB) UVB and narrowband (NB) UVB.
Broadband UVB was the first type of light therapy used to treat skin diseases. Broadband
UVB is composed of the wavelengths 290-320 nanometers. Shorter treatment times are
administered to help avoid obtaining a sunburn type reaction. With this type of
treatment, patients experience shorter remission times.
Narrowband UVB is the newest form of UVB light therapy. Narrowband UVB is composed
of the wavelengths 311-312 nanometers. At present, this type of light treatment
is used most frequently. Patients experience longer remission times and experience
less of a sunburn type reaction than that experienced in the BB UVB light units. View Pictures
Another form of phototherapy is PUVA, a combination of Oxsoralen capsules and UVA
light. Unlike UVB light therapy, PUVA requires more diligence in coordinating time
the medication is taken with the time of treatment. Treatments must be administered
after 90 minutes of taking the prescribed amount of Oxsoralen. Although this type
of light therapy is the most effective, it is not commonly used. Patients may experience
multiple side effects from the medication such as nausea, vomiting, dizziness, headaches,
burning, itching, and photosensitivity, often causing them to seek other types of
treatment. Since PUVA penetrates the skin deeper than UVB light, there is an increased
risk of developing invasive skin cancer.
The Xtrac laser treats patients with stable plaque psoriasis involving less than
10% body surface. It treats the affected area with a
concentrated laser that delivers NB UVB light. The unit is similar to the NB UVB
booth however the laser allows us to deliver higher doses to specific localized
areas. Side effects include possible sunburn type reaction, increased pigmentation,
dryness and itching. View Pictures
- Medications
Systemic Oral Medications
With persistent psoriasis, when topicals and/or light therapy are no longer effective,
an oral medication is often prescribed. This type of therapy requires a commitment
from the patient, including scheduled lab work and frequent office visits. Oral
medications frequently show the highest success rate in improving psoriasis. The
oral medications most commonly used in this office are Methotrexate and Acitretin,
commonly known as Soriatane.
Methotrexate
Approved for treatment of psoriasis in the 70’s, Methotrexate is one of the oldest
most successful forms of treatment still being used today. Methotrexate works by
affecting the immune system. It prevents the rapid turnover of skin cells seen in
psoriasis. This drug is taken once weekly. Patients with renal, hepatic or hematological
abnormalities or with a history of alcohol abuse are advised not to use Methotrexate.
Since it is filtered through the liver, a liver biopsy is frequently taken after
patient’s overall intake exceeds a total of 1 gram. Although Methotrexate is often
used with patients who continue to come for light therapy, it is not recommended
they receive treatments for 48-72 hours after taking the drug. The physician will
also have regular labs drawn to monitor any adverse effects on the body. The most
common side effects of Methotrexate are nausea, vomiting, mouth sores and headaches.
Patients on Methotrexate often experience photosensitivity so precaution should
be used if light therapy is continued.
Acitretin (Soriatane)
Acitretin is used in several types of psoriasis. It works especially well for the
Pustular and Hand/Foot type. Women of child bearing age are advised not to use the
drug due to the possibility of having a child with birth defects. Soriatane is safe
for long term use in men and women of non-child bearing potential. This drug has
no serious interactions with other types of oral medications. It also works extremely
well when used in combination with phototherapy.
Acitretin is an oral retinoid which is derived from vitamin A. Retinoids work by
controlling how the cells multiply, including how fast skin cells grow and are shed
from the skin. Since the drug can affect lipid levels, blood tests to monitor cholesterol
and triglycerides are required. In addition, a yearly ankle x-ray or bone density
scan may be recommended in patients who are on a long duration of therapy. Common
side effects include hair loss, dry skin, peeling of the fingertips and chapped
lips. Patients with a history of depression are not advised to take Acitretin.
-
Biologic Drugs
These types of drugs are taken in injection and infusion forms. They are the newest
forms of treatment for Psoriasis and Psoriatic Arthritis. This type of therapy is
convenient for many patients because it is administered at home. These therapies
are often fast acting however as with all therapies there are a few patients who
may respond better to one type of treatment or another. These types of therapies
also require close monitoring. This includes lab draws, frequent office visits and
yearly tests such as tuberculosis screening. Biologics, unlike oral medications
which are made by chemicals, are made from proteins. They work by blocking particular
immune cells that are overactive in the immune system of patients with psoriasis.
Although there are very few side effects to the biologics, the long term effects
are still unknown. As more and more of these agents are developed, our approach
to effectively treat psoriasis is becoming more targeted. This allows us specifically
to target the exact aberrant part of the immune process which leads to psoriasis
without affecting the immune system as a whole. Each patient’s therapy is individualized
depending on the type of psoriasis, response to other treatments, and overall health
and medical history.
Currently there are five biologics approved to treat psoriasis, these include Enbrel,
Amevive, Raptiva, Remicade and Humira.