I think other comments had it right, but I can add that having a bad taste may also make the medicine more effective. An unpleasant experience makes people think “I hate it, it’s disgusting. It must be strong”. Wich actually makes it more effective ! It adds a placebo component to the medicine basically. So maybe they do it for that too ?
It’s because when formulating medications it’s not only the active ingredient (drug) we consider when making a dosage form, we also take into consideration excipients – pharmacologically inactive (no effect on the body), but has a role in making your dosage form (tablet, capsule, suspension, syrup etc.)
Now the more excipients you add into the formulation (sweeteners, colorants, flavorants, preservatives) the higher the chance that the ingredients in your formulation will not play nice with each other (each ingredient has a chance to have a chemical reaction with other ingredients). The higher the chance that your formulation will not be stable (spoils/breaks down easily) or be effective (drug doesn’t perform as expected)
TLDR – more ingredients more chance of being unstable hence more chance of being unusable.
If you have problems with taking your medications please consult your pharmacist, they can even recompound your medication into something more palatable if need be
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