How to Say "to tranquilize" in Spanish
The Spanish word for “to tranquilize” is “sedar” — B1 level.

Examples
El doctor decidió sedar al paciente antes de la cirugía.
The doctor decided to sedate the patient before the surgery.
Tuvimos que sedar al perro para cortarle las uñas.
We had to sedate the dog to cut his nails.
Esta música suave ayuda a sedar mis nervios.
This soft music helps to soothe my nerves.
Direct Action Word
This verb usually needs a 'target' (the person or animal being sedated). Because you are doing it to someone, you often use the 'personal a' (e.g., 'Sedar a Juan').
A 'False Friend' Warning
Don't confuse 'sedar' with 'sed' (thirst) or 'seda' (silk). While they look similar, 'sedar' is strictly about calming or medicating.
Confusing with 'Sentar'
Mistake: “Voy a sedar en la silla.”
Correction: Voy a sentarme en la silla. (Sedar means to medicate/calm, while sentar means to sit down).
Related Translations
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