A slide of one patient, taken before treatment, showed that her skin had been much more lined and freckled.

Children with congenital heart disease may need to take antibiotics before dental treatment.

Digital images were taken of the skin of 30 women before and after treatment, and the pixels meticulously compared, a process similar to, say, that used to measure a diabetic ulcer.

For example, people with certain heart problems, such as an artificial heart valve, need to take an antibiotic before dental treatment to prevent a heart infection (endocarditis).

They looked at tissue samples taken from patients before treatment and found that 64% tested positive for a high-risk strain of HPV (HPV 16).

Avoid taking MAO inhibitors within 2 weeks before and during treatment with this medication.

You may take antithyroid medicine for several weeks or months before treatment with radioactive iodine.

Because the high doses of chemotherapy can destroy the bone marrow, marrow is taken from the bones before treatment.

Avoid taking MAO inhibitors (isocarboxazid, linezolid, moclobemide, phenelzine, procarbazine, rasagiline, selegiline, tranylcypromine) during or 2 weeks before and after treatment with this medication.

Taking vitamin E before and after treatment with cisplatin chemotherapy might reduce the chance of getting nerve damage.