Greetings, welcome to the Forums.
This plant is a form of Kalanchoe behariensis, a succulent shrub in the Stonecrop Family (Crassulaceae), native to Madagascar.
There are a number of different cultivars of Kalanchoe behariensis available in the trade.
However, the plant pictured is difficult to identify to cultivar, as it is severely etiolated due to being grown in very low light.
This lack of sufficient light, rather than overwatering, is the cause of the lank, drooping stems and leaves. Such an etiolated plant may persist indefinitely in this sorry state, but the lack of light will make the plant susceptible to breakage, disease, and rot.
I recommend that this plant be grown in brighter light, either direct or indirect. Kalanchoe behariensis can do quite well in full sun conditions. However, the plant should be moved into more light in several stages in order to prevent scorching due to sudden change.