Dalacin C (clindamycin) can cause various side effects, however, insomnia and sleep disturbances are not among the most commonly reported side effects of this drug. The most common side effects are diarrhea, rash, abdominal pain, nausea and changes in liver test results. Symptoms such as jitteriness may be related to general malaise or stress, but are not a typical side effect of Dalacin C.

I encourage you to report the symptoms you experience to your doctor, as well as to report the occurrence of an adverse effect of the preparation. Reporting side effects allows you to increase control over medicines available on the market. We wrote more about how and why to report side effects in the article: 

https://www.gdziepolek.pl/artykuly/jak-i-dlaczego-zglaszac-dzialania-niepozadane

If sleep problems persist or worsen, it is worth consulting a doctor or pharmacist to rule out other causes and consider possible treatment modifications.

If you need more personalized advice, you can use teleconsultations here:

https://www.gdziepolek.pl/telekonsultacja/

The availability of Dalacin C in pharmacies in Polish can be checked at the following address:

https://www.gdziepolek.pl/produkty/21077/dalacin-c-kapsulki/apteki