Modafinil is very similar to caffeine in its effects, only much stronger. Modafinil is a stimulant & an eugeroic that’s used to promote wakefulness, boost overall productivity at school or while working. It's a cognitive enhancer functioning by increasing the concentration of dopamine levels in the brain.

Can modafinil & caffeine be mixed? What's the safety of mixing it? Although they are both stimulants producing the same effects, both work with different mechanisms especially in how they stimulate the sympathetic nervous system (SNS).

Although it can be mixed, precaution should come in handy. Mixing two products of the same drug class can potentially lead to increased chances of some negative effects.

Here https://modafinil.org/modafinil-caffeine/ is an in-depth guide on how both substances work and how to safely mix them for beneficial effects & precautions on beating some chances of negative effects – when to avoid such a combination.

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00:42 What Is Modafinil?
01:13 Modafinil vs. Caffeine
05:21 Do Caffeine & Modafinil Mix?
06:22 How to Mix Caffeine with Modafinil
09:32 Remember These 3 Things Whenever Mixing Modafinil with Caffeine
12:53 Is Mixing Caffeine & Modafinil Safe?
15:20 Where to Buy Modafinil