Apparatus and methods for introducing a solid or semi-solid intraocular drug-containing implant into the anterior chamber of an eye are described. The drug-containing implant can be a rod-shaped biodegradable implant that may provide for the extended release of the drug and may be effective for treating a medical condition of the eye. The apparatus is ergonomically designed in the shape or style of a pen with tactile surfaces for easy gripping, a needle-rotation knob to permit orientation of the needle bevel in relation to the eye, and a spring-actuated mechanism for consistent deployment of the implant.