diff --git a/routes/admin/drug.py b/routes/admin/drug.py
index 82af4d96..00f122b5 100644
--- a/routes/admin/drug.py
+++ b/routes/admin/drug.py
@@ -77,3 +77,18 @@ def update_price_factor():
         return {"status": "error", "message": str(e), "code": e.code}, e.httpStatus
 
     return tryCommit(db, {"idSegment": id_segment, "idDrug": id_drug, "factor": factor})
+
+
+@app_admin_drug.route("/admin/drug/add-default-units", methods=["POST"])
+@jwt_required()
+def add_default_units():
+    user = User.find(get_jwt_identity())
+    dbSession.setSchema(user.schema)
+    os.environ["TZ"] = "America/Sao_Paulo"
+
+    try:
+        result = drug_service.add_default_units(user=user)
+    except ValidationError as e:
+        return {"status": "error", "message": str(e), "code": e.code}, e.httpStatus
+
+    return tryCommit(db, result.rowcount)
diff --git a/services/admin/drug_service.py b/services/admin/drug_service.py
index ae76e39b..d304bbd4 100644
--- a/services/admin/drug_service.py
+++ b/services/admin/drug_service.py
@@ -129,3 +129,57 @@ def update_price_factor(id_drug, id_segment, factor, user):
         conversion.factor = factor
 
         db.session.flush()
+
+
+def add_default_units(user):
+    roles = user.config["roles"] if user.config and "roles" in user.config else []
+    if RoleEnum.ADMIN.value not in roles and RoleEnum.TRAINING.value not in roles:
+        raise ValidationError(
+            "Usuário não autorizado",
+            "errors.unauthorizedUser",
+            status.HTTP_401_UNAUTHORIZED,
+        )
+    schema = user.schema
+
+    query = f"""
+        with unidades as (
+            select
+                fkmedicamento,
+                idsegmento,
+                min(fkunidademedida) as fkunidademedida
+            from (
+                select 
+                    pagg.fkmedicamento,
+                    pagg.idsegmento,
+                    pagg.fkunidademedida
+                from
+                    {schema}.prescricaoagg pagg
+                where
+                    pagg.fkmedicamento in (
+                        select fkmedicamento from {schema}.medatributos m where m.fkunidademedida is null
+                    )
+                group by
+                    pagg.fkmedicamento,
+                    pagg.idsegmento,
+                    pagg.fkunidademedida 
+            ) a
+            where 
+                fkunidademedida is not null
+            group by
+                fkmedicamento,
+                idsegmento
+            having count(*) = 1
+        )
+        update 
+            {schema}.medatributos ma
+        set 
+            fkunidademedida = unidades.fkunidademedida
+        from 
+            unidades
+        where 
+            ma.fkmedicamento = unidades.fkmedicamento
+            and ma.idsegmento = unidades.idsegmento
+            and ma.fkunidademedida is null
+    """
+
+    return db.session.execute(query)