einnehmen
to take
To take in medication, food, or liquid.
Der Patient muss diese Tablette zweimal täglich einnehmen.
The patient has to take this tablet twice a day.

to take / earn / occupy
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to take
To take in medication, food, or liquid.
Der Patient muss diese Tablette zweimal täglich einnehmen.
The patient has to take this tablet twice a day.

'Einnehmen' is a separable verb. The prefix 'ein-' comes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Er nimmt jeden Morgen seine Vitamine ein.
He takes his vitamins every morning.
The meaning of 'einnehmen' is almost always made clear by the object. Is it about medication, money, a place, or a standpoint? The object tells you the exact meaning.
Der Verein nimmt durch Mitgliedsbeiträge viel Geld ein.
The association takes in a lot of money through membership fees.
In a medical context, 'einnehmen' is typically combined with 'Tabletten' (tablets), 'Medizin' (medicine), 'Tropfen' (drops), or also 'eine Mahlzeit' (a meal).
Bitte nehmen Sie die Tropfen mit etwas Wasser ein.
Please take the drops with some water.
When it comes to finances, the object of 'einnehmen' is almost always money or an amount of money. Typical objects are 'Geld' (money), 'Spenden' (donations), 'Steuern' (taxes), or 'Gebühren' (fees).
Der kleine Laden nimmt an einem guten Tag 500 Euro ein.
The small shop takes in 500 euros on a good day.
In the meaning 'besetzen' (to occupy), 'einnehmen' is used almost exclusively in a military or strategic context. Typical objects are 'eine Stadt' (a city), 'eine Festung' (a fortress), or 'eine Stellung' (a position).
Die Armee versuchte, die feindliche Stellung einzunehmen.
The army tried to capture the enemy position.
To express an opinion, 'einnehmen' is used in fixed expressions such as 'einen Standpunkt einnehmen' (to take a standpoint), 'eine Haltung einnehmen' (to adopt an attitude), or 'eine Position einnehmen' (to take a position).
Er hat in der Debatte einen klaren Standpunkt eingenommen.
He took a clear standpoint in the debate.
The expression 'jemanden für sich einnehmen' (to win someone over) has a fixed structure. The pronoun 'sich' is obligatory and refers to the subject of the sentence.
Mit ihrem Lächeln nahm sie das ganze Publikum für sich ein.
With her smile, she won the whole audience over.
to take
'nehmen' and 'einnehmen' can both mean that you take medication or consume something to eat or drink. 'nehmen' is very general and especially common in everyday language: you take a tablet, have a coffee, or have something to eat. 'einnehmen' sounds more precise and a bit more formal with medication, for example in instructions from a doctor or on packaging. With normal food, you usually do not say 'ich nehme Brot ein', but rather 'ich esse Brot' (I eat bread) or 'ich nehme ein Stück Brot' (I'll have a piece of bread). The words are especially easy to confuse with medication, because both are possible there.

Bitte nehmen Sie das Medikament morgens mit Wasser ein.
Please take the medication in the morning with water.
Vor der Reise nimmt sie eine Tablette gegen Übelkeit.
Before the trip, she takes a tablet for nausea.