Spaans [adj]Engels [adj] ▶eficaz [adj] Este medicamento es eficaz contra las alergias. ▶effective [adj] This medicine is effective against allergies. ▶eficaz [adj] ▶efficient [adj] ▶eficaz [adj] El médico eligió un tratamiento eficaz para su afección. ▶efficacious [adj] The doctor chose an efficacious treatment for her condition.