For people with high blood pressure who have to take pills, recent studies have offered good news: Changes in daily routine can lower blood pressure enough to let some people with mild hypertension postpone the need for medicine or avoid it altogether. Bolstering previous research, new experiments suggest that people who can lose excess weight, exercise regularly and limit alcohol to a drink or two a day can sometimes lower their readings enough to stay off drugs. The study's director is Dr.Paul Whelton, dean of the School of Public Health and Tropical Medicine at Tulane University in New Orleans.