Headaches and nausea may occur with the drugs used to treat shingles. These are usually taken as pills. People with severe infections may need acyclovir injected directly into the veins, which may cause kidney problems. Drugs for pain may cause stomach upset, allergic reactions or sleepiness. Exact side effects depend on the drug used.
Eye drops can cause irritation and allergic reactions in the eyes.
In most cases, the shingles go away and people can return to normal activities. Pain may remain at the site of the healed blisters. Drugs for pain may be needed. People with eye infection may require long-term eye care from an eye doctor. Most cases are monitored by the affected person at home.