diff --git a/erpnext/healthcare/doctype/consultation/consultation.py b/erpnext/healthcare/doctype/consultation/consultation.py
index b8155b9..e16c221 100755
--- a/erpnext/healthcare/doctype/consultation/consultation.py
+++ b/erpnext/healthcare/doctype/consultation/consultation.py
@@ -78,7 +78,7 @@
 	create_invoice_items(physician, sales_invoice, company)
 
 	sales_invoice.save(ignore_permissions=True)
-	frappe.db.sql(_("""update tabConsultation set invoice='{0}' where name='{1}'""").format(sales_invoice.name, consultation_id))
+	frappe.db.sql("""update tabConsultation set invoice=%s where name=%s""", (sales_invoice.name, consultation_id))
 	appointment = frappe.db.get_value("Consultation", consultation_id, "appointment")
 	if appointment:
 		frappe.db.set_value("Patient Appointment", appointment, "sales_invoice", sales_invoice.name)
diff --git a/erpnext/healthcare/doctype/lab_test/lab_test.py b/erpnext/healthcare/doctype/lab_test/lab_test.py
index 0daf9cb..6fd9535 100644
--- a/erpnext/healthcare/doctype/lab_test/lab_test.py
+++ b/erpnext/healthcare/doctype/lab_test/lab_test.py
@@ -291,5 +291,5 @@
 
 @frappe.whitelist()
 def get_lab_test_prescribed(patient):
-	return frappe.db.sql(_("""select cp.name, cp.test_code, cp.parent, cp.invoice, ct.physician, ct.consultation_date from tabConsultation ct,
-	`tabLab Prescription` cp where ct.patient='{0}' and cp.parent=ct.name and cp.test_created=0""").format(patient))
+	return frappe.db.sql("""select cp.name, cp.test_code, cp.parent, cp.invoice, ct.physician, ct.consultation_date from tabConsultation ct,
+	`tabLab Prescription` cp where ct.patient=%s and cp.parent=ct.name and cp.test_created=0""", (patient))
diff --git a/erpnext/healthcare/doctype/patient/patient.py b/erpnext/healthcare/doctype/patient/patient.py
index 98526cc..f4d9a43 100644
--- a/erpnext/healthcare/doctype/patient/patient.py
+++ b/erpnext/healthcare/doctype/patient/patient.py
@@ -111,10 +111,10 @@
 
 @frappe.whitelist()
 def get_patient_detail(patient, company=None):
-	patient_dict = frappe.db.sql(_("""select * from tabPatient where name='{0}'""").format(patient), as_dict=1)
+	patient_dict = frappe.db.sql("""select * from tabPatient where name=%s""", (patient), as_dict=1)
 	if not patient_dict:
 		frappe.throw("Patient not found")
-	vital_sign = frappe.db.sql(_("""select * from `tabVital Signs` where patient='{0}' order by signs_date desc limit 1""").format(patient), as_dict=1)
+	vital_sign = frappe.db.sql("""select * from `tabVital Signs` where patient=%s order by signs_date desc limit 1""", (patient), as_dict=1)
 
 	details = patient_dict[0]
 	if vital_sign:
diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
index eab2f2d..2647034 100755
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
@@ -125,7 +125,7 @@
 	create_invoice_items(appointment_id, physician, company, sales_invoice)
 
 	sales_invoice.save(ignore_permissions=True)
-	frappe.db.sql(_("""update `tabPatient Appointment` set sales_invoice='{0}' where name='{1}'""").format(sales_invoice.name, appointment_id))
+	frappe.db.sql("""update `tabPatient Appointment` set sales_invoice=%s where name=%s""", (sales_invoice.name, appointment_id))
 	frappe.db.set_value("Fee Validity", fee_validity.name, "ref_invoice", sales_invoice.name)
 	consultation = frappe.db.exists({
 			"doctype": "Consultation",