Can Children Receive Sedative Injections?

My son is now 3 years old and often catches colds. His last cold lasted over a month, accompanied by a few days of fever. He received several days of anti-inflammatory injections and took antibiotics for about two weeks, resulting in a weakened constitution. A pediatrician suggested injecting sedative to boost his immunity. Can he receive the injection?
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Can Hand, Foot, and Mouth Disease Spread to Adults?

Hand, Foot, and Mouth Disease is an enterovirus infection, easily transmitted to adults. However, adults have a higher immunity and may not become ill, but those with weak constitutions or insufficient immunity may still be affected. Patients should develop good living habits, maintain regular schedules, avoid smoking and drinking, and exercise regularly to enhance their immunity and reduce the risk of recurrence.
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