Vitamin A deficiency can be prevented by including foods rich in vitamin A or beta-carotene as a regular component of the diet; liver, meat, eggs, milk, and dairy products are examples. Foods rich in beta-carotene include red peppers, carrots, pumpkins, as well as those just mentioned.eta-carotene is a form of pre-vitamin A, which is readily converted to vitamin A in the body. Night blindness is the first symptom of vitamin A deficiency. Prolonged and severe vitamin A deficiency can produce total and irreversible blindness.
If a person does develop sexual side effects, such as impotence or a decrease in libido, it is difficult to know whether these problems are caused by another condition or by Valtrex itself.f you are taking Valtrex and sexual side effects occur, your healthcare provider may adjust your dosage of Valtrex or prescribe another medication for your condition.
Several studies have examined how well Valtrex treats shingles, cold sores, and genital herpes. In one study, people younger than 50 years of age with shingles were treated with Valtrex within three days of the beginning of a rash. In people who were not treated with the drug, it took three days for the formation of new blisters to stop. For the people who were treated with Valtrex, the blisters stopped forming one day sooner. The drug will not, however, change the length or severity of postherpetic neuralgia, which is severe pain that can occur after the shingles rash has healed. Valtrex is also not a cure for shingles.