You definitely don't want to be seriously ill here. For anything serious get on a plane and head straight to Bangkok.
Chinese Hospital Modern medical equipment and supplies, but sometimes short of trained personnel.
Pharmacie Stocks basic medicines. On weekends, hours are variable.
Provincial Hospital OK for minor problems but for any serious illnesses consider flying to Bangkok or returning to Vientiane and neighbouring hospitals across the Thai border. Note that the hospital in Luang Prabang charges double for consultations at weekends or anytime after 4pm.