
das Gegenmittel
antidote
A substance that cancels out or neutralizes the effect of a poison.
Nach dem Schlangenbiss wurde ihm sofort ein Gegenmittel verabreicht.
After the snakebite, he was immediately given an antidote.
antidote / remedy
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antidote
A substance that cancels out or neutralizes the effect of a poison.
Nach dem Schlangenbiss wurde ihm sofort ein Gegenmittel verabreicht.
After the snakebite, he was immediately given an antidote.

remedy
A measure or action that counteracts a negative development or a problem.
Bildung ist das beste Gegenmittel gegen Vorurteile.
Education is the best remedy against prejudice.
The word is made up of 'gegen' (against) and 'Mittel' (remedy/means). So it is literally a remedy that works 'gegen' (against) something, whether a poison or a problem.
Gibt es ein wirksames Mittel gegen diese Krankheit?
Is there an effective remedy for this disease?
'Gegenmittel' (antidote/remedy) is almost always used with the preposition 'gegen' (against) + accusative to name what it works against. This pattern applies to both the literal and the figurative meaning.
Die Ärzte suchten ein Gegenmittel gegen das seltene Gift.
The doctors searched for an antidote to the rare poison.
You can tell from the context whether the literal or the figurative meaning is intended. If it is about 'Gift' (poison), 'Schlangenbiss' (snakebite), or 'Vergiftung' (poisoning), it is literal. If it is about abstract problems like 'Langeweile' (boredom), 'Hass' (hatred), or 'Armut' (poverty), it is meant figuratively.
Das Gegenmittel wirkte schnell gegen das Schlangengift.
The antidote worked quickly against the snake venom.
In a medical context, an antidote is often 'verabreicht' (administered), 'gegeben' (given), 'gespritzt' (injected), or 'entwickelt' (developed).
Dem Patienten wurde sofort das richtige Gegenmittel verabreicht.
The patient was immediately given the right antidote.
In the figurative meaning, 'Gegenmittel' (remedy) is often combined with abstract concepts. Typical phrases are 'ein Gegenmittel gegen Einsamkeit' (a remedy against loneliness), 'gegen Ungerechtigkeit' (against injustice), or 'gegen Langeweile' (against boredom).
Regelmäßiger Sport kann ein wirksames Gegenmittel gegen Müdigkeit sein.
Regular exercise can be an effective remedy against fatigue.
remedy / cure
A Heilmittel is intended to eliminate a problem or undesirable situation. A Gegenmittel counteracts a negative development without necessarily bringing it to an end completely. Heilmittel is therefore more suitable for an intended solution, while Gegenmittel refers to a measure that slows a deterioration or reduces its impact.

Zusätzliche Aushilfen dienen vorerst als Gegenmittel gegen den wachsenden Personalmangel.
For now, additional temporary workers are serving as a countermeasure against the growing staff shortage.
Die langfristige Reform soll ein Heilmittel gegen den Personalmangel sein.
The long-term reform is intended to be a remedy for the staff shortage.