Make sure you have adequate travel health insurance and accessible funds to cover the cost of any medical treatment abroad and repatriation. Even with fully comprehensive travel insurance, private hospitals in Namibia may insist on proof of payment (cash or credit card) before starting treatment. They may also insist you pay up front, reclaiming from your insurer at a later date.
Some travel insurance policies are not recognised by some Namibian hospitals, you should check with your provider if their product is accepted in Namibia before you travel and seek alternative coverage where necessary. Medical evacuation from remote areas can take time.
If you need emergency medical assistance during your trip, dial 211111 (in Windhoek) or 10111 (elsewhere) and ask for an ambulance. You should contact your insurance/medical assistance company promptly if you are referred to a medical facility for treatment.