An accelerated heart rate may be one of the common side effects of Anafranil, especially at the beginning of treatment. If your doctor has advised you to start treatment with half the dose, take it as directed by your doctor. With Anafranil SR (prolonged-release tablets), the drug is released gradually throughout the day, and taking the whole tablet may increase the side effects of the drug. The GdziePoLek.pl service also allows you to book a medicine in a selected stationary pharmacy and pick up after presenting a prescription: https://www.gdziepolek.pl/produkty/4943/anafranil-sr-75-tabletki-o-przedluzonym-uwalnianiu/apteki If your rapid heart rate is a nuisance or occurs for a long time, you should consult your doctor. It is the doctor who decides whether to treat the patient m.in based on the history of the disease and the previous response to treatment. Only a doctor can decide on a possible change in pharmacotherapy. However, you should avoid changing your dose or how you take it yourself without talking to your doctor. The GdziePoLek.pl service also allows you to obtain a teleconsultation with a doctor: https://www.gdziepolek.pl/telekonsultacja I enclose additional information that may be helpful: https://www.gdziepolek.pl/artykuly/jak-poradzic-sobie-z-nerwica https://www.gdziepolek.pl/artykuly/czy-bac-sie-dzialan-niepozadanych-lekow