To treat a severely itchy scalp, use a prescription antibiotic, an antifungal medication, a lotion or a steroid shampoo as suggested by your doctor, notes HowStuffWorks.com. If over-the-counter medications fail to treat psoriasis, doctors often prescribe topical medications to apply on the scalp instead of the hair.
If topical medications are not effective, doctors may recommend either laser or nonlaser light therapy, states HowStuffWorks. For example, excimer laser therapy targets affected areas of psoriasis and does not damage surrounding healthy areas. Doctors also sometimes prescribe medications that can be infused, injected or taken orally.
Itchy scalp caused by ringworm requires treatment, such as an oral antifungal medication, that lasts for approximately six weeks, notes HowStuffWorks. Exercise caution when treating lice with a prescription lotion or shampoo, as these products can lead to severe side effects when applied incorrectly.
Itchy scalp sometimes occurs due to contact dermatitis, a condition that makes the skin sensitive to certain hair products or dyes, explains HowStuffWorks. In this case, switch to a different product to prevent itchiness. Shampoos containing zinc pyrithione, coal tar, salicylic acid or selenium sulfide are usually effective in getting rid of dandruff. Use different shampoos to determine which product works best in treating the condition and pair the treatment with a balanced diet and a healthy lifestyle.