Anyone taking sublinginual ( dissolving under the tongue ) Avanza

I have been put on the Avanza in the past few weeks and each time i take it at night 5 tabs .I get a funny feeling like my mouth has gone to sleep .Have you experienced this when you have had it .I`m not sure if it`s a normal reaction to this or a side effect .The sensation does not last very long but it`s there after each time i take them.