diff --git a/freeadmin/contrib/adapters/tortoise/adapter.py b/freeadmin/contrib/adapters/tortoise/adapter.py
index 7f323cd..cc58957 100644
--- a/freeadmin/contrib/adapters/tortoise/adapter.py
+++ b/freeadmin/contrib/adapters/tortoise/adapter.py
@@ -16,6 +16,7 @@
 
 from __future__ import annotations
 
+from inspect import isawaitable
 from typing import Any, Iterable
 
 from tortoise import Tortoise, connections
@@ -511,7 +512,9 @@ async def m2m_clear(self, manager) -> None:
         """
         if manager is None:
             return
-        await manager.clear()
+        clear_result = manager.clear()
+        if isawaitable(clear_result):
+            await clear_result
 
     async def m2m_add(self, manager, objs: Iterable[Model]) -> None:
         """Add multiple objects to a many-to-many relation manager.
diff --git a/tests/test_tortoise_adapter_m2m.py b/tests/test_tortoise_adapter_m2m.py
new file mode 100644
index 0000000..c240cdd
--- /dev/null
+++ b/tests/test_tortoise_adapter_m2m.py
@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+"""Unit tests for Tortoise adapter many-to-many helpers."""
+
+from __future__ import annotations
+
+import pytest
+
+from freeadmin.contrib.adapters.tortoise.adapter import Adapter
+
+
+@pytest.fixture
+def anyio_backend():
+    """Force AnyIO to run tests with the asyncio backend."""
+
+    return "asyncio"
+
+
+class SyncRelationManager:
+    """Relation manager with a synchronous ``clear`` implementation."""
+
+    def __init__(self) -> None:
+        """Initialize the cleared flag for assertions."""
+
+        self.cleared = False
+
+    def clear(self):
+        """Mark the relation as cleared using a synchronous method."""
+
+        self.cleared = True
+        return None
+
+
+class AsyncRelationManager:
+    """Relation manager exposing an asynchronous ``clear`` coroutine."""
+
+    def __init__(self) -> None:
+        """Initialize the cleared flag for assertions."""
+
+        self.cleared = False
+
+    async def clear(self):
+        """Mark the relation as cleared using an awaited coroutine."""
+
+        self.cleared = True
+
+
+@pytest.mark.anyio
+async def test_m2m_clear_supports_sync_managers():
+    """Ensure ``m2m_clear`` handles managers with synchronous ``clear``."""
+
+    adapter = Adapter.__new__(Adapter)
+    manager = SyncRelationManager()
+
+    await adapter.m2m_clear(manager)
+
+    assert manager.cleared is True
+
+
+@pytest.mark.anyio
+async def test_m2m_clear_supports_async_managers():
+    """Ensure ``m2m_clear`` awaits managers exposing async ``clear``."""
+
+    adapter = Adapter.__new__(Adapter)
+    manager = AsyncRelationManager()
+
+    await adapter.m2m_clear(manager)
+
+    assert manager.cleared is True
+
+
+# The End
+