#include <stdio.h>
#include <stdlib.h>
#include <math.h>
 
int main (){
	char letra;
	int miligrama;  //<-------
	printf("Escolha uma alternativa:\n");
	printf("a - Amoxicilina\n");
	printf("b - Sulfametoxazol/Trimetoprina\n");
	printf("c - Azitromicina\n");
	scanf("%c", &letra);
	switch (letra){
	    case 'a': 
	        printf("Qual e a miligrama da sunspecao?\n");
	        printf("1 - 250mg/5ml\n");
	        printf("2 - 400mg/5ml\n");
	        printf("3 - 500mg/5ml\n");
	        scanf("%d", &miligrama);   //<-------
	        printf("%d", miligrama);   //<-------
	        break;
 
	}
}

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YQox

a
1