Esther 80mg Injection should always be administered by a healthcare professional and selfadministration should be avoided This injection is typically used when oral administration is not feasible It is important to note that certain side effects may occur including headaches dizziness muscle pain and joint pain Additionally there may be some injection site reactions such as pain swelling or redness If these side effects persist for an extended period it is advisable to consult your doctor Additionally you may be required to undergo weekly blood tests for 4 weeks to check for the presence of malarial parasites