die Einnahme
intake
The act of swallowing medication, food, or liquids. Often used in a medical context.
Der Arzt empfahl die Einnahme der Tablette mit reichlich Wasser.
The doctor recommended taking the tablet with plenty of water.

intake / revenue / capture
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intake
The act of swallowing medication, food, or liquids. Often used in a medical context.
Der Arzt empfahl die Einnahme der Tablette mit reichlich Wasser.
The doctor recommended taking the tablet with plenty of water.

'Die Einnahme' is the nominalization of the separable verb 'einnehmen' (to take in). This origin connects all meanings: taking medicine, taking in money, and taking a city.
Das Unternehmen konnte hohe Gewinne einnehmen.
The company was able to take in high profits.
The three main meanings are clearly separated by context. Medical context ('Tabletten' (tablets), 'Arzt' (doctor)), financial context ('Geld' (money), 'Kasse' (cash register), 'Gewinn' (profit)), or military context ('Stadt' (city), 'Festung' (fortress), 'Truppen' (troops)).
Die Einnahme des Medikaments sollte nach dem Essen erfolgen.
The medication should be taken after eating.
When it is about money, the plural 'die Einnahmen' is almost always used. The counterpart to this is 'die Ausgaben' (expenses).
Wir müssen unsere Einnahmen und Ausgaben genau kontrollieren.
We have to monitor our revenue and expenses carefully.
In a medical context, 'Einnahme' is often combined with temporal prepositions to indicate the right time, e.g., 'vor der Einnahme' (before taking it), 'nach der Einnahme' (after taking it), or 'während der Einnahme' (while taking it).
Lesen Sie die Packungsbeilage vor der ersten Einnahme sorgfältig durch.
Read the package leaflet carefully before taking it for the first time.
expense / issue / output
'die Ausgabe' and 'die Einnahme' form a clear contrast when it comes to money. 'Ausgaben' are amounts of money that you pay. 'Einnahmen' are amounts of money that you receive. In this sense, both words are often used in the plural, especially when talking about a budget, a business, or a month. The simple way to think of it is: 'Ausgaben' go out, 'Einnahmen' come in.

Die Einnahmen des kleinen Cafés waren im Sommer besonders hoch.
The small café's revenue was especially high in the summer.
Nach dem Einkauf trägt sie ihre Ausgaben in eine Liste ein.
After shopping, she enters her expenses in a list.